Question 1

What is the difference between HPS® and Royal Purple® API-licensed motor oils?

Colin King · Accepted Answer

Royal Purple API-licensed motor oil is formulated specifically to meet current American Petroleum Institute (API), International Lubricant Standardization and Approval Committee (ILSAC), and Association des Constructeurs Européens d’Automobiles (ACEA) specifications for new vehicle warranties. Over the last several years, these specifications have become increasingly restrictive on certain additives, particularly those commonly used for anti-wear. As such, API/ILSAC compliant oils aren’t the best solution for consumers that have modified their vehicles or those simply looking for the greatest performance.

HPS is formulated with consumers in mind. This motor oil line offers the incredible performance and protection provided by Royal Purple’s proprietary Synerlec technology as well as a dramatically enhanced anti-wear package. HPS is also the choice for those seeking to maximize horsepower and torque, while reducing wear, heat and fuel consumption. HPS is the most robust engine oil Royal Purple makes for non-racing applications.

Question 2

Will HPS harm my catalytic converters?

Colin King · Accepted Answer

No. Testing has shown no short or long term adverse affects on catalysts in mechanically sound vehicles.

Question 3

Can I use HPS in my diesel engine?

Colin King · Accepted Answer

Absolutely. All viscosities of HPS are formulated for use in gas and/or diesel engines and are ideal for those with modified diesels or those simply looking for more performance out of their diesel.

Question 4

Are Royal Purple oils compatible with other motor oils?

Colin King · Accepted Answer

Yes. Royal Purple lubricants are fully compatible with mineral or synthetic oils. No special procedures are necessary when switching to Royal Purple. We recommend against intentionally creating a mixture of different brands or product lines of engine oils.

Question 5

Can your motor oil be used in older engines?

Colin King · Accepted Answer

Yes. Mileage and/or age is not a factor when used in a mechanically sound engine. In high-mileage applications, we do recommend running a minimum of two short 3,000 mile (5,000 km) intervals before extending the oil drain intervals. This will enable Royal Purple’s high solvency to remove existing deposits gradually; if excessive, such deposits can restrict oil flow, as well as reduce the oil service life significantly.

Question 6

Can I use Royal Purple in my brand new car?

Colin King · Accepted Answer

Yes. Royal Purple currently offers many viscosity grades of API-licensed motor oils1. To allow for proper break-in of the engine, Royal Purple recommends waiting until the manufacturer’s first scheduled oil change or a minimum of 2,000 miles (3218 km) in new gasoline engines. Allow a minimum of 6,000 miles (9656 km) before using Royal Purple in diesel engines.

Question 7

How many miles can I go between oil changes in vehicles that use gasoline?

Colin King · Accepted Answer

Royal Purple suggests adhering to manufacturer’s recommended oil change intervals for vehicles under warranty using Royal Purple API-licensed SAE motor oils. With Royal Purple HMX® and HPS series oils, drain intervals may be extended to 15,000 miles (20,000 km) or one year, whichever occurs first in street-driven, mechanically-sound vehicles. For guidelines specific to your vehicle, we recommend contacting our technical department 888-382-6300.

Once manufacturer warranty is no longer a concern, with the Royal Purple API-licensed SAE motor oils drain intervals may be extended up to 12,000 miles (19,200 km) or one year, whichever occurs first in street driven, mechanically-sound vehicles.

Question 8

How many miles can I go between oil changes in vehicles that use diesel engine oil?

Colin King · Accepted Answer

Royal Purple suggests adhering to manufacturer’s recommended oil change intervals for vehicles under warranty. Vehicles no longer under warranty using Royal Purple Duralec Super, Duralec Ultra, or HPS engine oils, that hold 10-quarts of oil or more, can extend oil change intervals up to 15,000 miles (24,140 km) or one year, whichever occurs first in street-driven, mechanically-sound vehicles. For smaller capacity engines, oil change intervals should be every 12,000 miles (19,312 km) or one year. For guidelines specific to your vehicle, we recommend contacting our technical department at rpautotech@royalpurple.com

Question 9

Is Royal Purple synthetic motor oil?

Colin King · Accepted Answer

Yes.  Royal  Purple  Motor  Oils  are  composed  of  a  proprietary  formulation   of   synthetic   base   oils   and   synthetic   additives   containing iso-paraffinic diluents.Royal  Purple  Break-in  oil  is  the  only  non-synthetic  automotive  engine oil offered by Royal Purple.

Question 10

Will synthetic oil cause my engine to leak or consume more oil?

Colin King · Accepted Answer

Properly  formulated  synthetic  oils  will  generally  not  cause  an  engine oil leak. Synthetic oils possess a higher degree of natural solvency, which can clean and remove deposits left by previous oils. The removal of extensive oil deposits can expose marginal or damaged oil seals, which may then leak. If an engine currently has excessive oil consumption (i.e. greater than 1 quart / 1,000 miles)  the  recommended  course  of  action  is  to  solve  the  oil  consumption problem before switching to a synthetic.

Question 11

Should I use an oil additive with Royal Purple?

Colin King · Accepted Answer

No. We strongly recommend against using any oil additives as do most automotive manufacturers. Engine oils are formulated with a fine balance of additives (anti-foam, corrosion inhibitors, anti-wear,  detergent  /  dispersants,  oxidation  inhibitors),  and  more is not necessarily better. The use of an oil additive could upset the balance resulting in reduced performance.

Question 12

Does Royal Purple maintain its purple color after it’s put into service?

Colin King · Accepted Answer

No. The dye that’s used to color the oil dissipates shortly after being put into service. The oil will appear brown at some point.

Question 13

Do your motor oils contain zinc/phosphorus?

Colin King · Accepted Answer

Yes.  All  Royal  Purple®  engine  oils  contain  the  zinc/phosphorus  compound zinc dialkyl dithiophosphate (ZDDP), but the maximum amounts  are  restricted  by  the  current  API  oil  specifications.  For  stock,  non-performance  automotive  street  applications,  API  SN  licensed  oils  are  OK.  For  better  wear  protection,  Royal  Purple  HPS  and  XPR  lines  of  engine  oils  are  formulated  with  a  higher  concentration  of  the  zinc  and  phosphorus  anti-wear  additive  and  are  suitable  for  ALL  flat  tappet  and  roller  tappet  camshaft  valve  trains.  For  a  specific  recommendation,  contact  our  tech  department at 888-382-6300.

Question 14

Can your oil be used with flat tappet cams?

Colin King · Accepted Answer

Yes.  For  stock,  non-performance  valve  trains,  Royal  Purple API-licensed  oils  (API  SN  and  ILSAC  GF-5  licensed)  are  OK.  For  upgraded  performance  flat  tappet  camshafts,  and  vintage  high  performance  engines,  we  recommend  our  HPS  or  XPR  engine  oils.  For  a  specific  recommendation,  contact  our  tech  department at 888-382-6300.

Question 15

Is a special oil filter required when using Royal Purple?

Colin King · Accepted Answer

While no special oil filter is required, we do recommend upgrading to a high quality oil filter. A high quality filter will prevent contaminants from circulating through the system and causing damage.

For best performance and filtration, we recommend Royal Purple Extended Life Oil Filters. See our oil filter information page for more details or visit our dealer locator to find the dealer nearest you that carries our new filters.

Question 16

Is HMX® different from your API-licensed engine oils?

Colin King · Accepted Answer

Yes,  HMX  is  fortified  with  Royal  Purple’s  proprietary  Synerlec  additive  technology  as  well  as  additional  seal  conditioners  beneficial  to  higher  mileage  engines  to  maintain  elasticity  of  gaskets and seals. HMX is also formulated with a slightly higher amount  of  anti-wear  additive  to  provide  more  wear  protection  for older engines.

Question 17

Why should I use a high mileage oil

Colin King · Accepted Answer

A properly formulated High Mileage oil like HMX will help reduce oil  consumption  and  restore  lost  power.  HMX  is  chemically  enhanced to revitalize hardened seals reducing oil consumption common in higher mileage engines.

Question 18

Are Royal Purple Extended Life Oil Filters compatible with all conventional and synthetic oils?

Colin King · Accepted Answer

Yes. All Royal Purple premium oil filters are compatible with both types of motor oils.

Question 19

Do Royal Purple Extended Life Oil Filters meet all original equipment requirements and vehicle warranty?

Colin King · Accepted Answer

Royal   Purple   filters   meet   or   exceed   original   equipment   manufacturers’ requirements. All new car warranties remain in effect when using Royal Purple Filters.

Question 20

How does the quality of Royal Purple Extended Life Oil Filters compare with other manufacturers’?

Colin King · Accepted Answer

Royal  Purple  premium  filters  use  100%  synthetic  micro-glass  media for superior particle removal with 99% filtration efficiency at 25 microns and larger, and 80% of particles 10 microns and larger.

Question 21

What is the recommended change interval?

Colin King · Accepted Answer

Vehicles under warranty should follow the vehicle manufacturer’s recommended  change  intervals.  For  non-warranty  applications,  the useful life of Royal Purple premium oil filters is the life of the engine oil. Vehicles driven in severe conditions should follow the change  intervals  recommended  in  their  owner’s  manual;  severe  conditions  are  defined  as  racing  or  commercial  applications,  frequent towing or hauling, extremely dusty or dirty conditions, or excessive idling.

Question 22

What is the efficiency rating and at what micron size?

Colin King · Accepted Answer

The efficiency of a filter is described in terms of a percentage of particles caught at a certain particle size(and larger). Using the ISO 4548-12 multi-pass filtration efficiency test, Royal Purple filters are:

-99% at 25 micron and larger

-98.7% at 20 micron and larger

-80% at 10 micron and larger

Question 23

What function does the wire-backed media provide?

Colin King · Accepted Answer

The wire backing is to support the filtration media. This further reduces  the  chance  that  the  filter  media  could  collapse.  The  use of stainless steel wire provides a strong, durable, AND low restriction way to provide the support.

Question 24

Why are Royal Purple Extended Life Oil Filters constructed with a silicone anti-drain back valve?

Colin King · Accepted Answer

The silicone anti-drain back valve prevents dry starts by preventing oil drain-back during shutdown. Silicone outperforms and outlasts standard rubber in both extreme cold and hot oil temperatures.

Question 25

What are the beta ratios?

Colin King · Accepted Answer

Average beta rating based on ISO 4548-12 multi-pass test methods:

B100 = 25 (at 25 or greater micron, media is 99% efficient.)

B75 = 20 (at 20 or greater micron, media is 98.7% efficient. Also considered absolute rating.)

B5 = 10 (at 10 micron or greater, media is 80% efficient.)

Question 26

What viscosity is recommend for motorcycles?

Colin King · Accepted Answer

Follow the manufacturer’s recommendations regarding viscosity. Most manufacturers recommend a 10W-40 for 4-cycle, liquid-cooled motorcycles. Air / oil cooled motorcycles typically specify a 20W-50. Check your owner’s manual for verification or contact Royal Purple’s Automotive Technical Department at 888-382-6300 for assistance.

Question 27

How many miles can I go between oil changes?

Colin King · Accepted Answer

Royal Purple® suggests adhering to manufacturer’s recommendedoil change intervals for vehicles under warranty. Vehicles that are no longer under warranty can frequently double or triple the number of miles between oil changes depending on the vehicle, its condition, the way it’s used (excessive idling), and the oil filter that is used. For guidelines specific to your vehicle, we recommend contacting our technical department at rpautotech@www.royalpurple.com.

Question 28

What product do you recommend for 2-cycle gearboxes?

Colin King · Accepted Answer

For  2-cycle  motorcycles  with  a  separate  transmission  fluid  reservoir, we recommend Royal Purple Synchromax or an engine oil from our Max-Cycle or HPS series. Please contact Royal Purple Automotive Technical department at 888-382-6300 for assistance

Question 29

What do you recommend for the primary case and transmission?

Colin King · Accepted Answer

Royal  Purple  Max-Cycle®  10W-40  or  20W-50  motor  oil  may  be  used  in  the  primary  tank.  For  transmissions,  Royal  Purple  recommends  Max-Cycle  20W-50  or  Max  Gear  75W-90.  NOTE:  DO NOT use Max Gear lubricants in the primary or in any other component containing a wet clutch.

Question 30

What oil do you recommend for Harley Davidson®motorcycles?

Colin King · Accepted Answer

For all Harley Davidson and other air-cooled V-twin motorcycles, we recommend Royal Purple Max-Cycle 20W-50.  If the owner’s manual recommends a 10W-40 or 15W-40, Max-Cycle 10W-40 is the best option.

Question 31

Will Royal Purple Max-Cycle cause my clutch to slip?

Colin King · Accepted Answer

No. Royal Purple Max-Cycle engine oils are rated JASO MA2 in the  JASO  T903:2011  Clutch  Friction  Test.  MA2  is  the  highest  wet clutch compatibility rating.

Question 32

I notice a strange odor when running Max-Cycle in my Harley. Is this normal?

Colin King · Accepted Answer

Yes.  Royal  Purple  uses  a  different  additive  chemistry  than  most  manufacturers, which is the very foundation of the benefits RP offers. This technology has a distinctive odor, different from the common odor of exhaust gases to which most have become immune.

Question 33

Can I use Royal Purple to pre-mix with alcohol, methanol or nitro-methane?

Colin King · Accepted Answer

No. Royal Purple’s 2-cycle oils are formulated for use in gasoline applications only.

Question 34

What product do you recommend for oil injected engines?

Colin King · Accepted Answer

HP 2-C® is recommended for most stock oil-injection applications.For  cold  weather  oil-injection  applications,  Snow  2-C®  is  recommended.

Question 35

What product do you recommend for pre-mix in my 2-cycle engine?

Colin King · Accepted Answer

HP 2-C may be used in pre-mix applications.

Question 36

What product should I use in my oil-injected snow machine?

Colin King · Accepted Answer

For  low  temperature,  oil-injected  applications,  Royal  Purple  Snow 2-C is recommended.

Question 37

Does Royal Purple 2-Cycle oil void new engine warranties?

Colin King · Accepted Answer

Royal  Purple  HP  2-C  meets  the  performance  requirements  of  any  2-stroke  gasoline  engine;  however  it  does  not  carry  any  OEM oil licenses.

Question 38

Can I use racing oils in my street car?

Colin King · Accepted Answer

Yes.  Royal  Purple  XPR®  racing  oils  are  fully  formulated  engine  oils  with  complete  additive  packages  needed  for  long-term  use.  The XPR ultra-light viscosity 0W-8 is considered suitable only for dedicated  competition  engines  that  are  built  specifically  to  use  very low viscosity engine oils. Non-ultra light viscosities, XPR 0W-20, 0W-30, 5W-20, 5W-30, 10W-40 and 20W-50 may be used in street  driven  and  daily  driver  applications,  street  and  track  duty  vehicles  and  dedicated  competition  applications  with  gasoline  or  exotic  fuels.  Pleas  note:  Royal  Purple  XPR  racing  oils  do  not  conform  to  API  and/or  ILSAC  licensing  requirements  and  should  not be used when manufacturer’s warranties are an issue.

Question 39

Can I run your oils with exotic fuels (alcohol, methanol, etc.)?

Colin King · Accepted Answer

Yes.  Royal  Purple’s  lubricants  can  be  used  with  exotic  fuels.  For the best protection, Royal Purple® has formulated its XPR®specifically  with  this  in  mind.  The  XPR  oils  are  formulated  to  combat  fuel  emulsification  to  hold  up  even  better  than  Royal  Purple’s other engine oils in alcohol and methanol applications. Royal  Purple  Nitro  Plus™  oils  are  the  best  choice  for  blown  alcohol,  Nitro-methane  and  any  other  race  application  with  excess  fuel  dilution.  Royal  Purple’s  other  synthetic  engine  oils  will  still  perform  better  than  conventional  racing  oils;  however,  significant fuel dilution will reduce the effectiveness of these oils much more than the XPR and Nitro Plus oils.

Question 40

How will running your product affect my oil temperature?

Colin King · Accepted Answer

In most cases, vehicles with properly functioning cooling systems can reduce oil temperatures by 5-20°F by using Royal Purple.

Question 41

What is the difference between your API-licensed motor oils and your racing oils?

Colin King · Accepted Answer

Royal  Purple  API-licensed  motor  oils  are  formulated  to  provide  unparalleled performance and protection while complying with API  and  ILSAC  specifications.  XPR  and  Nitro  Plus  racing  oils  vary  in  viscosity  and  formulation  from  the  API-licensed  motor  oils to provide the greatest performance and protection possible, without regard to API, ILSAC, or OEM specifications.

Question 42

My retailer doesn’t carry XPR – why can’t they order it?

Colin King · Accepted Answer

We do not restrict any automotive product from any retailers that carry Royal Purple consumer products. Any lack of availability of Royal Purple products at local retail stores is due to the choices made by the store owners/buyers. Retailers choose the products they stock and order for a myriad of reasons. Many times, a local retailer will special order Royal Purple products if you can provide the part number. Another option is to shop online. Several online retailers, including Amazon.com, JEGS.com, Lucky7Trucks.com, PacePerformance.com, and SummitRacing.com carry just about all  Royal  Purple  automotive  and  consumer  products,  and  they  will ship directly to you.

Question 43

Is it true that your oils lose their performance edge after six or eight passes? (Drag Racing)

Colin King · Accepted Answer

No.  Royal  Purple  has  not  found  any  evidence  that  it  shows  deterioration  in  performance  after  being  subjected  to  race  conditions.  Excessive  fuel  dilution  may  effect  the  performance  of any engine oil; however, XPR and Nitro Plus oil offer greater protection than other oils even with excessive fuel contamination.

Question 44

Can I use your Max ATF® in my transmission?

Colin King · Accepted Answer

Check your owner’s manual for verification. A complete list of warranty applications can be found on our Max ATF product page.

Question 45

My vehicle has a limited-slip differential. Do I need to add additional friction modifiers when using your Max Gear?

Colin King · Accepted Answer

No. All viscosity grades of Max Gear are formulated with limited-slip friction modifier necessary for some limited-slip differentials.  No additional additives should be necessary.

Question 46

My vehicle’s transmission specifies an API GL-4 gear oil. Can I use Max Gear?

Colin King · Accepted Answer

Yes. Max Gear is completely non-corrosive to soft yellow metals (brass, bronze, copper) so it is synchronizer-safe like a GL-4 gear oil.  However,  because  of  Royal  Purple’s  proprietary  Synerlec  additive technology, Max Gear oils retain the load carrying and shock protection capability of a GL-5 gear oil.

Question 47

What happens when fuel breaks down?

Colin King · Accepted Answer

It  forms  non-combustible  gums  that  form  deposits  in  fuel  systems  /  combustion  chambers,  which  decreases  engine  performance / fuel economy and increases emissions.

Question 48

Will Max-Clean® rejuvenate old fuel?

Colin King · Accepted Answer

No, but it will prevent it from degrading any further, and allow it to be safely used without forming engine deposits.

Question 49

How long does Max-Clean stabilize fuel?

Colin King · Accepted Answer

When  used  at  our  recommended  dosages,  Max-Clean  will  stabilize fuels with less than 10% ethanol for up to 2 years. For fuels  containing  10%  or  great  ethanol  content,  Max-Clean  will  stabilize for up to 1 year.

Question 50

With what fuels does Max-Clean work?

Colin King · Accepted Answer

Max-Clean is suitable for use in all liquid automotive-type fuels, including gasoline, ethanol, diesel, and bio-diesel.

Question 51

Can Max-Clean be used in modern, fuel injected engines?

Colin King · Accepted Answer

Yes, it will not harm catalytic converters or oxygen sensors, and will clean/remove deposits in port injected, direct injected, and carbureted engines.

Question 52

How does Max-Clean remove deposits?

Colin King · Accepted Answer

It contains polyetheramine (PEA), a proprietary detergent that solubilizes deposits so they can be burned during the combustion cycle in an engine.

Question 53

Does Max-Clean® increase octane?

Colin King · Accepted Answer

No, but a cleaner burning engine has a reduced octane requirement,which allows less expensive, lower octane gasoline to be used without the risk of detonation.

Question 54

What is the recommended treat rate for Max-Clean?

Colin King · Accepted Answer

Pour entire contents of can into a nearly empty tank and refuel. One  (1)  can  treats  up  to  20  gallons.  For  tank  sizes  outside  of  this  range,  use  one  (1)  ounce  per  gallon.  In  2-cycle  engines,  to  ensure  best  mixing  with  the  2-cycle  fuel/oil  mixture,  we  recommend  adding  Max-Clean  to  the  gas  tank  prior  to  putting  the 2-cycle fuel/oil mixture into it.

Question 55

What makes Max-Boost® any better than other octane boosters?

Colin King · Accepted Answer

Royal  Purple  Max-Boost  provides  up  to  30  points  (3  octane  numbers) increase in fuel octane, which meets or exceeds the boost of any other non-lead consumer octane boosting product available,  and  it  carries  the  added  benefits  of  stabilizing  fuel,  cleaning  deposits,  and  providing  protection  for  non-hardened  exhaust valve seats (lead substitute). It effectively replaces 2 to 4 products, depending on your needs.

Question 56

How do I use Max-Boost?

Colin King · Accepted Answer

Each 16oz bottle of Max-Boost treats up to 25 gallons of gasoline with a recommended dosage of 1 ounce of Max-Boost per gallon of fuel. To ensure best mixing with fuel, it is best to add Max-Boost to your fuel tank at fill-up, prior to putting the fuel into the tank.

Question 57

Is Max-Boost a good product for any vehicle?

Colin King · Accepted Answer

Max-Boost is safe for use in any gasoline and gasoline/ethanol blend of fuel, but many non-performance cars do not benefit from high octane fuel. If the fuel stabilization and cleaning benefits of Max-Boost are what you want, rather than the increase in octane, we recommend Royal Purple Max-Clean Fuel System Cleaner & Stabilizer.

Question 58

I have a [carbureted/throttle body injected /port injected/direct injected] performance engine. Will Max-Boost work for me?

Colin King · Accepted Answer

Yes, Max-Boost works in any gasoline or gasoline/ethanol blend fuel delivery system and will work great for any engine that runs best with high octane fuel.

Question 59

What makes Max-Tane® any better than other diesel fuel treatments?

Colin King · Accepted Answer

Royal Purple Max-Tane is better than any other consumer diesel additive because it does the job of every other consumer diesel fuel  additive.  Max-Tane  is  a  cetane  booster,  a  fuel  lubricity  enhancer, a fuel anti-gel, fuel system and injector cleaner and improves  fuel  economy  up  to  10%.  Royal  Purple  Max-Tane  effectively replaces up to 4 other diesel fuel additive products.

Question 60

What types of fuels is Max-Tane intended for?

Colin King · Accepted Answer

Royal Purple Max-Tane is formulated for use in any diesel-type vehicular  fuel  including  #1  and  #2  diesel,  biodiesel,  and  ultra-low sulfur diesel fuels.

Question 61

How do I use Max-Tane?

Colin King · Accepted Answer

Royal Purple Max-Tane is available in a 20 ounce can. Each 20 ounce can treats up to 100 gallons of fuel. To ensure best mixing with fuel, it is best to add Max-Tane to your fuel tank at fill-up, prior to putting the fuel into the tank.

Question 62

I have a high performance diesel engine. What is the best treat-rate (dose) of Max-Tane?

Colin King · Accepted Answer

Royal Purple Max-Tane is available in a 20 ounce can. Each 20 ounce can treats up to 100 gallons of fuel. To ensure best mixing with fuel, it is best to add Max-Tane to your fuel tank at fill-up, prior to putting the fuel into the tank.

Question 63

What makes Max-Atomizer™ different than other fuel injector cleaners?

Colin King · Accepted Answer

It is the only additive formulated specifically for direct injection gasoline  (DIG)  engines,  and  is  the  most  concentrated  PEA  fuel  injector cleaner available on the market today.

Question 64

What is PEA?

Colin King · Accepted Answer

It is polyether amine, a powerful detergent proven most effective at removing coked deposits found on injectors in DIG engines.

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