Quote Originally Posted by BruceG View Post
Tom...you didn't say if it was for a race car or your truck. I'm trying a new 10w-40 syn oil(SYNMAX) in my 98 cup car. Seems like some engineers went and looked at the properties of all the good racing oils and formulated their own. It's about the same cost as Royal Purple, a little more than Redline,less than Mobil One racing oil and way less than Joe Gibbs. All these oils have far more ZDDP(zinc) and other additives that are removed from street oil because they eat the cat. converters. Flat tappet engines(such as small block chevys,fords,etc love the ZDDP.

You could also try Brad Penn(which is the old Kendall(sp?) GT green oil which is the only Pennsylvania crude still being pumped and is green(natural) in color.
Bruce, Truck Gets Rotella (no question on that) so looking for the Mazda Racer Internal Inspection revealed we might need a 5 or 10 weight to get to flow quicker to bearings then 40 or 50 on upper end. Used the Kendall GT for many years when they were Major Sponsor at Watkins Glen. working tech we had inside with the dealer and we got the GT-1 for nearly free! Because of the temps run by the Rotary use the Syntheic . T