i worked the mile hi nationals this pass weekend i got to talk to alot of the pro's etc.john force, the great shirley muldowney was a guest...alot of these top fuels,funny cars,stock cars use red line,lat (lubeatech advance engineering oils),torco, kendal most use a 60-70wt.stainless steel oil filters i even saw a fram and a k&n filter..the meet was a awesome three days.. i was with alot of the mopar corp ,castrol guys on a interesting note, brad penn oil just took over the old kendal ref but did not get the old kendal formulation!! found out the crews love lubeatech oils!!and red line..