Quote:
Originally Posted by bluesubie
Castrol 0W-30 is indeed API certified, although it meets the older API SL spec. The phosphorus content is only slightly higher than current GF5 oils. Although, it's nearly a 40 weight at operating temp and I would only use it in a forced induction or tracked 86.
-Dennis
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I was referring to the bottle not having the API certification label. Maybe it was certified but doenst meet current gf 5 standards. That's the way I understand it. As for the viscosity yes it higher but at 12.21 Cst @ 100c it's not much higher than a traditional 30 weight and my UOA shows it sheared to 10 Cst @ 100c after ~7500 Km's. Still completely fine, but I didn't want void my catalytic converter warranty should I they crap out.