[macalot]

Originally Posted by WoodBoss

Use Amsoil 5w30 and you will be better off.
http://www.bobistheoilguy.com/motor-oil-101/

When the Official GM Track spec sheet says use 15w50, that's what I use...so I drive the same oil on the street as well as the track, no big deal.
Now in the colder weather I'll change back to 5w30 and of course it won't be tracked at all or driven much then.