If you search the web for oil filter study you will come across a couple really good ones. From my own research I stay away from all WIX brands due to the lack of drain back valves, and the lower filter material quality. And I run every time someone suggests using any FRAM. I had two fram extra guard filter elements collapse on my Z and blocked all oil flow into the engine. Andrei ----- Original Message ----- From: "cruznmd" <racuti1@xxxxxxxxxxxx> To: <DMCForum@xxxxxxxxxxxxxxx> Sent: Wednesday, December 10, 2003 10:48 AM Subject: [DMCForum] Re: Oil Change Intervals Ah I see. My first oil filter was a "Wix" brand that was a freebie from John Hervey. I am now running the Purflux that supposedly has this check-valve in it. I did observe a rubber membrane over the circulation holes that the Wix brand filter did not have. That's very interesting to know. --- In DMCForum@xxxxxxxxxxxxxxx, "Andrei Cular" <acular@xxxx> wrote: > Rattle on startup has as much to do with the filter as it does the oil. A > good filter with an anti-siphon valve that works will keep oil up in the > engine much longer. So now when you start to turn over engine over the pump > doesn't have to fill the filter first, and the oil gets to the lifters much > quicker. > > I run mobile 1 0-40 in my Porsche. When cold the crank goes around 3 > times, on average, before the engine starts and in those 3 revolutions my > oil pressure gets up to 3bar(43.5psi). With convention 20-50 it would take > a couple a second or two after the engine started for the pressure to get up > that high. > > > > Andrei > > > > ----- Original Message ----- > From: "cruznmd" <racuti1@xxxx> > To: <DMCForum@xxxxxxxxxxxxxxx> > Sent: Wednesday, December 10, 2003 8:26 AM > Subject: [DMCForum] Re: Oil Change Intervals > > > Ha! Man that's cool. I'm not going to do it, but cool nonetheless. > > I say it was time to change the oil because it was dirty, and it was > the wrong type for the cold weather. When I'd start, I could hear > things rattle dry for about 1.5 seconds while pressure built up, also > evidenced by my gauge. > > I started up this morning in 30 degree weax and could not obeserve a > measurable time period where I could hear the engine rattle, plus the > gauge pressure rose during cranking, not just when the engine became > self-sustaining. > > Walt: I was wondering why this thing had such a large sump. Now I > know. Thanks for that knowledge. > > Also, people were wondering if I wrecked or already had blown rings > when I finished my head gasket replacement job. I was pleased to > notice that the oil level never went down due to burning past worn > rings. There's no blue smoke from the exhaust either. > > > --- In DMCForum@xxxxxxxxxxxxxxx, "Andrei Cular" <acular@xxxx> wrote: > > OK let me end this oil change debate. For $20 you can have an oil > analysis > > performed and a change interval tailored to fit your engine and > driving > > habits. Blackstone labs www.blackstone-labs.com does it and > provides a very > > nice report and recommendation. > > > > > > > > Andrei > > > > > > > > > > > > ----- Original Message ----- > > From: "Walter Coe" <Whalt@xxxx> > > To: <DMCForum@xxxxxxxxxxxxxxx> > > Sent: Wednesday, December 10, 2003 1:49 AM > > Subject: [DMCForum] Re: Oil Change Intervals > > > > > > > Question isn't "why change oil frequently?", is "why not?" > > > > Okay, I'll take a stab at answering the "why not". The > > DeLorean's PRV is a 6 cylinder version of an engine that was > > originally designed to be an 8 cylinder diesel. As such, > > the oil passage ways and the blah blah and the blah are all > > heavy duty and hold nearly 7 quarts of oil vs other engines > > that hold only 5 quarts, the 7 quarts don't get dirty as > > fast; blah, and the owners manual specifies 7500 mile > > intervals, so doing it at 2500 is a waste unless you have > > short spiked hair and wear an ear ring and do unusual (major > > blah!) things with your tools. I should have a curfew so I > > don't do these weird posts this late. > > > > blah = I don't feel like explaining it, I really don't know > > it that well, and you wouldn't agree with me anyway, so > > blah! > > > > Walt > > > > > > > > To unsubscribe from this group, send an email to: > > DMCForum-unsubscribe@xxxxxxxxxxxxxxx > > > > > > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > > > To unsubscribe from this group, send an email to: > DMCForum-unsubscribe@xxxxxxxxxxxxxxx > > > > Your use of Yahoo! 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