Transmission FAQs:

Can I use your Max ATF in my transmission?

Check your owner’s manual for verification. Royal Purple’s Max ATF is formulated exclusively for transmissions specifying a Ford Mercon® / GM Dexron® III fluid.

What product do you recommend for manual transmissions / transfer cases that specify a Ford Mercon® and / or GM Dexron® fluid?

For manual transmissions and / or transfer cases specifying a Ford Mercon® or GM Dexron® ATF, Royal Purple recommends either its Max ATF or for greater performance, its Synchromax.

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

No. All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone differentials. No additional additives are necessary.

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

Yes. Max-Gear possesses both API GL-5 and GL-4 certification. Max-Gear is formulated with Royal Purple’s proprietary, Synslide additive technology to provide the exceptional film strength necessary for GL-5 applications, yet it is noncorrosive to soft metals found in manual transmissions that specify a GL-4 rated lubricant.