slant 6 oil weight
And yet it still works, and for a lot cheaper. Why do you think newer engines use Viton seal material if neoprene would seal synthetics? I've tried synthetic oil and see no benefit in my old or new cars. Spend all the money you want and tell yourself it is better.
I have raced for over 30 years. I had an incident where the oil system leaked all the oil out. I raced 2.5 minutes with falling oil pressure and 2.5 minutes with ZERO oil pressure on Mobil 1 synthetic with a turbo'd engine loaded at over 1.5 HP per cubic inch. Engine never hiccuped or knocked. Tore it down after, and there were NO scratches or wear on the bearings, or rings, or pistons or anywhere. Nothing; looked like I had just assembled and never fired it up. Put it back together and ran it more. No way in hell a dino oil would ever manage that.
Before that, I raced for years on good grade dino oil (Castrol GTX). It was always black as could be after a long race. With Mobil 1, it gets a little brown. BIG difference in the break down (oxidation) of synthetic vs dino.
That is not 'telling myself it is better; that is real hard knocks experience and actual proof. Gainsay it if you wish but you have no way to know. And the idea that neoprene does not stand up to Mobil 1 is an odd idea for you hold on to, since Mobil 1 is actually a very highly refined petroleum oil. In words originally published by ExxonMobil:
"The difference is that synthetic oils [edit to clarify that they mean Mobil 1] undergo numerous additional highly advanced distilling, refining, and purification processes - and therefore are of a higher purity and quality than conventional mineral oils. This not only removes more impurities from the original crude, it also enables the engineering of the lubricant's individual molecules to be uniform and consistent, tailored to meet the specific high-performance demands of modern engines. These customized molecules provide higher levels of protection and performance, even in extreme conditions. "
As for the OP's needs: No one said he had to use anything in particular. A number of recommendations and comments were made. A good read of the link I provided is the best info I can point to; it is based on actual film strength testing.
