What is this? 1990? Do a google seach for the suit. Yes, they lowered the grade because of those crooks at castrol (since the average consumer is retarded).

RP is all marketing, Amsoil is mainly marketing, use Redline for quality and ay german castrol you can find.

 

German Castrol isn't too tough to find since autozone started carrying it again. I've heard that it's a pretty thick 30wt though and wouldn't be well suited to the high revving engines in these cars. I still have a bunch of it in my garage I should give it a shot.

 

Go for it, im on my 3rd fill of GC and loving it. And revs as good as it ever did.

 

PAOs are pretty unpolar, most additives struggle to disolve fully into them, this is why most additives are in Group 2 or 3 diluents, some use esters too. Esters are never great for wear though as they have a habit of displacing ZDDP and other Antiwear chemistry at the surface (there is only so much metal surface and no all the additives interact with the surface.

PAO also have a habit of shrinking seals. They are certainly not the holy grail of base oils that a lot of people think.

Personally I dont see why everyone worries so much about the base oil in their engine oils. The additive technology is just as important, if not more. The main reason of PAOs in oils is that they allow longer drain intervals, the certainly don't offer an inherent wear or friction benefit, and they have a habit of cross-linking and polymerising once the Anti Oxidant is depleted due to the uniform structure.

As much as people make out PAOs are perfect, they still can suffer from unsaturated carbon atoms from poor manufacturing. Group IIIs perform just as well

 

greddy will say it to u because they have their own line of lable oil. Greddy will certainly wants to make money of their motor oil too.