Since I've had some spotty experiences with their lubes, I'm not a big fan of Royal Purple. I've burned out 3 sets of rear axle bearings on my Camaro while using their gear lube. Given the regular track day use and the known weakness of the GM c-clip axle design, I would be willing to say that RP is not at fault, but it is not "miracle in a bottle" when it comes to high-temperature lubrication. Spotty experience #2 on Royal Purple was burning out a differential carrier bearing in my Dodge Ram diesel while towing through the California desert. On a Dana 70 axle, there's no excuse for that.
On the other side, I've used RP power steering fluid in my Camaro since it was practically new, and I used RP ATF in the 6-speed trans for 100k miles. No problems there.
But I'm not comfortable enough with RP to put it in my engine.
On the other side, I've used RP power steering fluid in my Camaro since it was practically new, and I used RP ATF in the 6-speed trans for 100k miles. No problems there.
But I'm not comfortable enough with RP to put it in my engine.