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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 07-13-2011, 01:30 PM   #1 (permalink)
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Engine ticking when warm

Just got hold of a 95 520i to replace my 92 525i which had badly rusted fuel lines. The 95 needs some suspension work, but is overall in better shape than the 92. Both cars have the M50 engine. The 95 does do something sort of disturbing, though. After it's been running for a bit, the engine starts ticking. I assume it's lifter noise as it speeds up and slows down with engine revs. It takes longer to start doing this when it's cooler, and happens rather quickly on warmer days.

I've done some reading about engine sludge, and wonder if that is the problem. I just changed oil using a high mileage Castrol anti-sludge oil in 20W/50. The underside of the oil cap was clean, and I didn't notice any black gunk in the engine itself before I started adding the new oil last weekend. The car doesn't seem to lack power from cold to warm. The engine doesn't chatter at all during a cold start up, only after it's warmed up.

Any thoughts from the experts?
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Old 07-13-2011, 02:11 PM   #2 (permalink)
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You may have answered your own question there mate...
Your Oil will be thicker when its cold !
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