ps. its not as easy on a v8 as you have to get to it from underneith.

I'm not sure which conduit you are referring to as I don't have a V8 but I can say that I've seen oil "wick" it's away up and along looms before. Sometimes small air pressure differences (caused by air moving past an opening - the venturi effect) will create a vaccum that can also suck oil up a channel etc. It's amazing where oil ends up once it gets outside the engine!! :rolleyes:

hmmm..interesting. Would love to hear from anyone that has had this vacumn oil issue up through the electrical conduit. The car was on the lift at BMW and they gave me a look. There were three electrical conduits I could see. The guy said there was oil coming out of one of them. Here is the link to a similar problem.

https://youtu.be/Oemb3G9PtJc

I understand this is V8 engine, but I believe it is the same oil P switch for different BMW engines.

I last replaced the OPS in my 1998 528i, factory was TRW, new is FEP.
I wrote the trick for M52 engine below:

https://www.bimmerfest.com/forums/sh...4&postcount=48

So, I haven’t yet got myself a hydraulic jack and stands yet so I took it to BMW. They did an investigation and wanted to replace the valve cover gaskets, timing case seals which they said were leaking. Both these jobs were over $2500 each. Then they wanted to look at the pan at the bottom. They observed the oil coming out the top but only said there was a sensor problem below. There was a couple of other things also. All up over $6000!!!. My heart sank. I thought about it and was sure the oil pressure switch was the main problem. All up $250 for the investigation. (there’s my jack and stands). So, I took it to a local mechanic and asked him to replace the switch. I even pointed out where it was. After a good degrease and running of the engine no oil leaks. The timing covers and valve cover gasket were actually fine. I will check them again in the near future.

So, now I am a very happy and relieved. All up ~$180. Phew! Another stealership story.

Final addition. I do have a small weeping leak but only from the left side valve cover gasket. Getting the courage to do that.