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@xxxxxxxxxxxx> 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! Groups is subject to http://docs.yahoo.com/info/terms/ Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/SIG=12c9h8kvl/M=267637.4116732.5333197.1261774/D=egro upweb/S=1705126215:HM/EXP=1071152503/A=1853618/R=0/*http://www.netflix.com /Default?mqso=60178338&partid=4116732> click here <http://us.adserver.yahoo.com/l?M=267637.4116732.5333197.1261774/D=egroupm ail/S=:HM/A=1853618/rand=905160240> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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