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.
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.
No. Testing has shown no short or long term adverse affects on catalysts in mechanically sound vehicles.
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 …
What is the difference between HPS® and Royal Purple® API-licensed motor oils? Read More »
