You don't want your oil filter to have a check valve in the DeLorean. It causes higher pressures that can ruin your oil pressure sender and actually shorten the life of your engine. ---Dan --- In dmcnews@xxxx, "Ryan Foster" <westiething@xxxx> wrote: > What about AC Delco brand PF13? Do the oil filters have to have a check > valve? Ryan vin#-16301 > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com