John and list, PTE/Teflon is THE ABSOLUT WORST thing to put into any engine. The PTE/Teflon (or PTFE as Slick 50 calls it) clogs the oil filter and the internal oil passages in the engine. The Teflon does not dissolve in the oil thus becoming a suspending particle. The oil filters job is to remove particles in the oil and since the Teflon is a particle, your wasting your money. Ever wonder why on the Slick 50 package it's called PTFE and not Teflon? Dupont did not want their product associated with it in anyway. They knew that it would cause engine problems so the manufacture of Slick 50 had to come up with their own name. As for the check valve, that's another "no-no" for the Delorean engine. Fram even advises NOT to use their filter on the Delorean engines because their filter that fits the D has a check valve in it. The oil filter on the D is on an angle where the highest point is the threaded part and the lowest point is the rounded part of the filter. It can hold plenty of oil in it after the engine is off. The cars that need check valves are the ones with the filter that are placed opposite of what the delorean's position is...meaning the threaded part of the filter is facing down. For example my Jeep Cherokee, the oil filter is in the opposite position of the Delorean where as the rounded top part of the filter being the highest point. It's all about gravity, you either love it or hate it. I can go on and on about other things such as there's no oil on the top half of the engine during start up...that's why it's important to start your car and let it "warm up" first to get all the fluids moving along before stepping on the gas and going. Here's a little visual for you: Get a glass and fill it with water, tilt it in the same position as the filter is on the D. There's still water in the glass right? If anyone would like a picture of what position the oil filter is in?email me?.my engine is out of the car with the PROPER oil filter on it and I can take a picture with my digital camera for your reference. The oil check valve on the Delorean will cause an unnecessary HIGH oil pressure which can lead to engine damage. I wouldn't go about saying the professional car mechanics/dealer/repair places are wrong and your right. If you want to stick with the Bosch oil filter that has the check valve on your car..then by all means do so but don't tell other people that don't know the effects of a check valve oil filter that the Delorean parts vendors are wrong! They (the Delorean parts dealers) have had YEARS of experience (and most of them well over 20 years experience) and know what's good and what's bad for these cars. Sorry I'm blowing off steam again ;-), Steve --- In dmcnews@xxxx, dherv10@xxxx wrote: > Dan, Let me explain why the anti-drain back valve filter or check valve as > you call it is so important in the Bosch oil filter and other applications. I > think you will better understand after this. <SNIP> >Without the anti-drainback valve you will promote more wear to > the engine because the filter won't hold oil because it will drain back to > the level of the car and lubrication will be slower. <SNIP> This is also why > PTE/Teflon was added to oil to help lessen the friction of metal from metal > during that critical time of start up and running. <SNIP> John Hervey > www.specialTauto.com