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Old 07-09-2019, 10:40 PM
Join Date: Jun 2014
Location: Omaha, NE
Posts: 1,175
cn90 is on a distinguished road
So, I have a little time to prove my theory as in the photo posted above.

I am glad I did this experiment, which was done on a 2003 325i M54 engine with 96K miles...

- Cleaned old oil leak as much as I can.

- Used windshield washer fluid and funnel + tubing combo to SLOWLY pour fluid along the L side of the engine block, mimicking OFH gasket leak...

- Windshield fluid is BLUE so I can see it, but you can use plain jane water too.

- Just go slow, a few mL at a time to allow the fluid to slowly drip down. Be patient!

- It took almost 10 minutes of slow dripping and voila, the fluid trickles down and appears at the infamous bolt.

- So, yes an OFH Gasket leak will allow the oil to trickle down that infamous bolt.

To summarize:

1. Do OFH Gasket first b/c it is $7 and "easy".

2. The VCG b/c it is also easy but a bit more involved (ignition wiring loom, the O-rings, scraping the sealing surface and retrieve broken bits and pieces etc.). BTW, use BMW VCG only, about $30-$40 or so.

3. Last resort is oil pan gasket and RMS. Luckily, my other car 1998 528i M52 engine with 180K...the oil pan gasket and RMS are bone-dry...

- See photos...
Attached Images
1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT

Last edited by cn90; 07-11-2019 at 12:04 AM.
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