Saki GT

Castrol seems to work well in the F series engine. I use it myself, change at 7.5k mi, and Blackstone tells me I can go longer, like 10k mi. I usually hit the 12 month mark before mileage though.

zeroptzero

looks like it is working well. Seeing iron wear drop after switching from Castrol 0w30 is something I seen on my car too, I think these engines work a bit better with thinner 30 weights as compared to thicker 30 weights or 40 weights. I think iron wear is affected by visosity.

HarryD

Wouldn't that imply that Mobil1 would be good for our engines? ... Majority opinion here doesn't like M1 for our motors blaming it on excessive oil burning/loss, but some even go as far as saying it causes premature TCT wear.

Is Castrol Edge thicker than Mobil1 at 10w30? I have to say my oil consumption has gone down a bit after I switched over.

zeroptzero

Mobil1 is a decent oil, there have been some reports of it burning off quicker in these motors but that doesn't make it a bad oil, it still performs decently and protects well enough. Mobil1 in the EP formula has shown some really good UOA reports on here. They also have a killer racing formula. I don't believe any report that links Mobil1 to the killing of TCT's, absolutely no proof of that that I have seen. Honda TCT's are a defective poorly designed part that will eventually die under any oil.

Castrol Edge 10w30 is thicker than Mobil1 in a 10w30 visc. by a small bit. Castrol 0w30 is a very thick 30 weight, bordering on a 40 weight oil. From what I've seen thicker oils don't protect any better in these motors, I initially though they would but I didn't see any benefit to running 5w40 and Castrol 0w30 over thinner oils.

INDYMAC

I think viscosity has very little to do with it Joey. The Edge FST with Ti is a much more advanced formula than the decade old Syntec 0W-30 formula. If Castrol R&D wanted to go back and update the GC additive package, they could make it competitive again using the same viscosity base oils.

zeroptzero

Yeah there are lots of variables in this comparison, I just found that on my car that my iron numbers were higher when I ran thicker weight oils like 5w40 and GC 0w30 and they were lower when I ran thinner weight oils.