On Sun, Jan 20, 2013 at 8:30 PM, Charley & Peggy Robinson <ccrobins at ktc.com> wrote: > Dunno why you guys don't just use Valvoline racing oil. I think that this has already been discussed. Racing oil doesn't have the detergents and other chemicals that are necessary when oil is used over a long period and not just for the duration of a race. Simon