Automotive and Theory > Drivetrain Theory

Extensive Gear Lube Study


Hey Bill,

Here is the independent study I was telling you about that has convinced me to stop using Royal Purple:

A Study of Automotive Gear Lubes

Out of 14 lubes tested, Royal Purple finished 3rd from last. I've been a proponent of RP since 2003. I have it in my truck (both axles, all three transfer cases, and transmission) and I've also been running it in my MR2. Not any more :nope:



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