Originally Posted By: swirlparanoid
Will the extra moly in the Toyota oil provide any extra protection the M1 cant? Would the difference in the cold thickness really make any difference at these temps?
yes, and yes.
will these differences increase the service life of your engine? pretty unlikely...
That said, if you can get both for a similar price, I'd go with the Toyota (that's what I'm doing in my Ford, and due to cost and availability, these are my top 2 contenders as well). The Toyota gets up to operating temps more quickly than other oils, and it flows better at start-up. That's a win-win in my book, so even if the benefits in engine protection are marginal, I'll take them if there are no downsides--and I don't see any. And while I'm not going to make any claims in fuel economy, since there are too many variables thrown into the mix, I do believe there are benefits there as well. For me, the cost is almost identical, so I go for the Toyota 0W20.