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Old 07-19-2006, 02:05 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,562
Originally Posted by mad1
Have you tried pressure testing your cooling system for leaks?
The ONLY way in many cases to know where it's coming from.

Mass-marketer auto parts stores like Auto Zone will rent the tool for this task.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 07-19-2006, 02:08 PM
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Join Date: Aug 2004
Posts: 44
You might try adding some UV dye to your coolant

Give it a few days and get a blacklight flashlight or UV leak detector (same thing) to see if you can see any glowing residue which would indicate the point(s) of leakage.

Something like this.
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Old 07-19-2006, 03:27 PM
Mistress's Avatar
No crying in baseball
Join Date: Apr 2006
Location: Inside a vortex
Posts: 624
Originally Posted by softconsult
My '92 M103 has had a headgasket leak for 130,000 miles. It used to be a combination of coolant and oil. Then I switched back to dino oil from Mobil 1 and the oil portion mostly stopped. I can crawl under the car with it idling and see the leak. It is very minute, but kind of spits from on point about
2/3 rds of the way back from the front of the block on the passenger side.
Requires topping off the coolant about every 400-500 miles. I have no oil in the coolant reservior.

Crawl under there with the engine running. Shine a strong flash light around the engine. Maybe get a telescoping mirror. I can't believe that you won't find it. Look at the bell housing of the transmission. Do you have any oil dripping on it.

Please wear goggles of some sort....
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