Originally Posted by Kam*Kuda
I am currently using Brad Penn 20-50
It is difficult to find and expensive.
I have used Brad Penn (now Penn Grade 1) for many years.
The 20W-50 is in my street/strip car since the oil gets hot driving on the street.
I have been using 10W-30 in my drag race cars for years. A local supplier sells a case of 12 for $75.

IMO, Mobil VR-1 is just fine.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1