He's right. The check valve is spring loaded thus requiring more pressure to push it open. This is what causes the higher oil pressure. Since the engine (or i should say oil pump) wasn't desinged to be used with a check valve, your putting more strain on it. Sort of like putting your thumb over a hose....the more pressure (resitance) you apply with your thumb over the hose opening...the higher the pressure of the water. --- In dmcnews@xxxx, "Doc" <doctor280@xxxx> wrote: > >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 > __________________________________________________________ > Where are you getting this information from???? > > Robert Starling > Vin#05252