I spoke with a guy from JGR today. He was very informative. I didn't really find any ground breaking information but some things he said were interesting.
Prior to Joe Gibb's racing oil, they were using a special oil from Shell. The oil was very good, but they were looking for better. They then went to use M1 Racing oil and that too was good and what a majority of NASCAR uses. They then hooked up with an additive supplier and blender who now makes the JGR oil.
If anyone runs this stuff, but has been previously using Redline, run a flush first. He said that the additive package for Redline and JGR don't get a long. He tells everyone to run a flush first. Didn't know why, but all of their testing showed this problem. They tell a lot of the drag racing guys to do this before changing to JGR oil.
Apparently a lot of people in nascar and drag racing are switching over to this oil. This is according to JGR though.
It has a lot of ZDDP and Moly. It's an oil made more for flat tappet engines. Would be of no value to any of us and on top of that, it has no detergents.
In all of their testing, they found that Groups IV and V work best together and that just a group V alone was not the best option. He emphasized how important it was to find that balance to achieve the best overall result. A mixture of PAO and Esters was found to be the best combo. (Redline uses PAO as well).
I can tell you based on what he told me that Mobil 1 (not the Wally World M1) is very popular in Nascar but it sounds like a lot of people are jumping ship and using JGR oil. All of the big guys custom formulate for these racing teams.
