Re: [bmw] <E34> 88 535i Oil pressure

[Bob Knight <bob@xxxxxxxxxxxxx>]

I had a similar problem. IIRC, it's the oil pump. There's a check
valve in the pump, and it's leaking. That's why you don't see it when
the car's not been standing for long. Solution: replace the pump.

Cheers,
Bob

On Thu, 18 Sep 2003, [ISO-8859-15] Ole Jxrgen Mfland wrote:

> Date: Thu, 18 Sep 2003 09:38:43 +0200
> From: "[ISO-8859-15] Ole Jxrgen Mfland" <olejm@domain.elided>
> To: bmw <bmw-digest@domain.elided>
> Subject: [bmw] <E34> 88 535i Oil pressure
>
> Lately I have noticed that in the morning when the engine is cold, the
> oil lamp is on for a longer time then it used to be. Actually it is on
> until just after the 'plong' when the check control says "Oil pressure".
>
> This only happens in the morning and in the afternoon when the car has
> standing for several hours and is completely cold. Under any other
> condition, the oil lamp goes off immidiately when starting the engine.
>
> I have changed the oil pressure sensor with no effect, I have changed
> the oil to semisynthetic Castrol GTX 5 (used to have mobil 1), the
> theory was that the oil was to thin to build up the pressure fast enough.
>
> And I have changed the oil filter including the small 'o-ring' on the
> filter house bolt, the theory here was that the oil would drain from the
> filter housing if the little 'o-ring' was old and worn.
>
> But no, nothing of this cured the problem.
>
> This really makes me nervous, and I'm having bad nightmares about having
> to make a complete engine rebuild...  But seriously, what should I look
> for next? Could it be the oil pump, or is it most likely the bearings
> that are worn?
>
> The car has 230k km (~143k miles) on it and it does not consume any oil
> between the oilshifts. It does not smoke any blue smoke either.
>
> --
> -OJ
> '88 BMW 535i
> '86 Kawasaki GPZ1000RX
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