I need to replace the diff cover. I was gonna use Royal Purple to refill with but I have a bucket of Castrol SYNGEAR in 50w and in 75-90w. Anything objections to using that instead?
From experience Royal Purple is a performance oil. So is Amsoil. We used this in our drag boats. If you got a HiPo car its great. I dont mean to knock, but Mobil1 tends to be bottom teir of the synthetic oils. It finishes almost dead last in every independent test. I dont know if RP or AO will be good or not for your HD towing, but they both do provide excellent lubricity. I would try to find a good heavy duty gear oil or some test of RP and AO in those situations as they are actually great companies.
I used royal purple in my trans am when I had it...never was impressed. It has Harland sharp rocker arms and with royal purple it made noise. When I switched it to Mobil 1 it cleans a lot of crap out of the engine and quiet down the top end. It's just my experience. I put RP in the rear if my truck and transfer case. I don't like it. Maybe it's just me
Like I said, we used it in EXTREME performance conditions. 11k+ rpms. Same with Amsoil. HD use, eeehhhh My oil I stick with Delo 400 or Rotella. Now my CJ7 with the AMC 304, I love the RP. 10W-30 all they way and its great. I just wouldnt use performance fluids in a application that requires the longevity while taking the beating we give our trucks.....
Yeah I hate amsoils marketing... But their independent tests by people like us on Bob is the oil guy.com shows it holds their own... Very good stuff, true synthetics where called, unlike other oils.
Then he had another problem. Not a single oil on the market will cause that. I ran two f150s with 5.0s with cheap cheap 10w-30 oil and got 300k miles out of both and sold them running. Any oil will make a motor last if u change it like your supposed to. I'll never blame an oil for blowing up a motor....it's always something else.
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