[madmaxx]

I guess I need a better definition of compatibility. I take it to mean they will not adversely affect one another, not that they combine to form one together. Hopefully a lubeoligist will chime in. I have always wanted to do what you are doing but was always informed not too. Our local Mobil Rep suggest against it for the reason I gave earlier, you will have two different compatible oils instead of one homogeneous oil.

I am referring to generic over the counter oils availabe at autozone, i have no idea about brad penn oils.

Originally Posted by patrickt

Got an email from a Joe Gibbs oil aficionado. He pointed out to me that Joe Gibbs racing oil touts itself as being full compatible between the different flavors of itself. Even gave me this link: http://www.joegibbsracingoil.com/tra...or-Which-15946


Brad Penn probably takes the same position.