I have not opened a purflux filter so I can't say with certainty but the spring loaded valve you are refering to is the bypass valve. On many filters there is incorporated inside a valve so that in the event the filter gets too plugged up it allows the pressureized oil to bypass the filter. The logic is that at least oil still gets to the internals even though it is not filtered. The specs vary widely so in general it is not a good idea to stick on any filter that physicaly fits without knowing about the valving and ratings. IMHO the Purflux is not so hard to get or so expensive that it is worth the possible risks. If you are having trouble getting it call a Delorean vender and order 2 so you have an extra! For those of you who think it is too expensive go see what filters for Jaguars cost! David Teitelbaum vin 10757 --- In dmcnews@xxxx, srubano@xxxx wrote: > 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