Charles Navarro

The GM EOS, part # 1052367 can be found online from here:

http://www.gmpartsdirect.com/results.cfm?vc=1&wtype=v4

I just took that to my local dealership and they honored that price, but made me buy a whole case.

I would not use the Redline racing oils, but rather their street oils, since they don't put detergents in the racing oil, unless this is for a true race car, being dumped out after every race. Otherwise, Redline is a great way to go with enough Zn and P to get by.

Rick Lee

How much of the EOS should I add per qt. of Mobil 1?

Rick Lee

Just found the SL-rated 15W-50 at Costco. I got 6 qts. Guess I'll add 1/4-1/2 of a bottle of the GM EOS stuff still, no?

Paul E. Dodd

Redline 15W50 (street formulation) for me. Even before this controversy I switched given the minimal cost savings of Mobil-1 vs. Redline (~$8/quart for Redline) and comments I had heard about declining quality of Mobil-1. FWIW off the side of the Redline bottle "Recommended for API CH-4/CG-4/CF/SJ/SH". It isn't actually API rated (doesn't have the seal) but that's Redline's recommendation. Don't see the point in mucking about trying to find the "correct" M1.