Re: Well isn't weird they offer 0,5,and 10 all in (archive)

Yes, it is! OW oils cost more to make than the 5W and 10W oils but to offer all three in a 30 may be nothing more than covering all bases for the buying public. But offering a 0W-40 really makes no sense to me. Very few if any newer cars require a **W-40 engine oil and then "only" if it's a mineral oil. Most all new cars require a 5W-30 synthetic oil and the only reason some car makers don't also recommend the 0W-30 is because so few oil makers have it available. BMW does list 0W-30 in the newer cars owners manual.

Our engines don't require a 40 (top number) to protect it except when using a mineral oil. 30 (top number) using synthetic oil is perfect for full protection. A 40 won't offer any more protection and could even be a negative from the standpoint of engine cooling, rev ability and horsepower.

For Mobil to come out with a 40 isn't very likely to be a big seller in my opinion.

Bob ///M3

I mean why use a 5W-30 or 10W-30 when the 0W- gives you better protection at startup and equal protection when warm. 0W-40 is probably a better choice because it flows quickly at startup but still has the protection characteristics of a 40 when warm.

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