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Most spin on filters have a check valve to keep (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Bill R. on November 27, 2000 at 19:07:34:

In Reply to: Please explain the filter draining down overnight. posted by Jr on November 27, 2000 at 17:23:46:

the oil from draining out when you shut off the engine, the idea being you wont have any pressure until all the spaces are filled. I think on the 535s bmw has a check valve in the block since it has a canister type filter. When you change your oil, the filter is full until you pull the center bolt out and then it drains. I was speculating that the little oring on the center bolt helps retain the oil in the filter. If you had a bad oring there, possibly letting the filter drain down overnight. Requiring that much longer on a cold start to fill back up before the system shows pressure.

only has the low pressure on initial startup when cold, which makes me think it either a viscosity problem or the filter is draining down overnight. It doesnt sound like a low pressure while running problem like a worn pump, bearings etc. Or a faulty sensor which would indicate at times other than initial startup. Just my $.02

BMW pumps are pretty sturdy...but I have read reports of loose pump bolts. However, Eric is right..if you don't mind spending the money AND you want peace of mind, have the tech check the pressure!

Good luck...

Phil C.
95 525i 5spd.

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