Quote:
Originally Posted by weirdpanda
I see 300 deg all too often on a hot day... Mobil 1 5-30, changed every track day.
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Good thing you change it every track event... I guarantee you that your M1 oil is oxidizing & breaking down under those conditions. Not to mention for most V8 engines of this type, you really want 10-11 CSt or so of viscosity under operating conditions. The 5w-30 M1 is probably 3-4 at those temps.
Mobil 1 is a very good oil, but not great. There are better choices. It's basically a Group 3 oil with a couple % of Group 4 or 5 (can't recall which at the moment) base stock blended in, so it's really not a "real" pure synthetic oil anymore. Last time I looked into the info I found about their additive package was nothing special either. The only M1 that is a "real" synthetic is the 0w-40 European formula, which is made from Group 4 base stock (similar to Amsoil) along with a small % of Group 5 mixed in. The only bad thing about their 0w-40 is they add alot of VII's to it that can shear down under high temps, so it'll need regular changing with track use as well.
I've seen oil analysis from cars pushed with M1 and let's just say I don't run it any more.
