It forms non-combustible gums that form deposits in fuel systems / combustion chambers, which decreases engine performance / fuel economy and increases emissions.
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.
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.
Check your owner’s manual for verification. A complete list of warranty applications can be found on our Max ATF product page.