ok, what grade oil doesn't everyone run? Right now i'm on the second oil change. Running 10W 30 Mobile one.

My 396 seemed to like Royal Purple 10w40

Redline 40W Race Oil.

Redline 50wt race oil. But it may not be right for your application. I use it for 2 reasons:
1. My engine was purposely setup with loose bearing clearances (.0025) and hence requires a 20/50 or similar weight oil to get the desired pressure at high temps.
2. It's a race car with no catalytic converters. This oil is not safe for cats and will eventually damage them.

Back when I was racing with cats still on the car I ran Redline 20/50 (blue bottle). When I redid the exhaust and yanked the cats, I switched to their race oil (red bottle). Before I started racing, I ran Valvoline VR1 20/50 at HPDE events for several years. It's a lot cheaper than the full-on race stuff and seemed to work fine - meaning nothing blew up and the one or two samples I sent to Blackstone got good marks.

I've personally seen very bad things with off-the-shelf Mobil 1 in HPDE cars. They make some great race oils but what you get at Autozone is very different and not suitable for the heat of track events (in my opinion).

I use 20w50 Valvoline VR1 synthetic.

I have been using Royal Purple 10-40.

Since I don't track the car in summer I put in Pennzoil Platinum 5-30.


May switch to Pennzoil Ultra 0-40 for track days.


EDIT

I just called Shell/Pennzoil, the lady recommended Pennzoil Ultra 5-40 Euro for our cars to trackday with.

Amazon.com has it for $45.43 for 6 quarts shipped.