M-Class (W166) Produced 2012-2015

Oil leak found

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Old 07-09-2024, 12:16 PM
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Oil leak found

Hi everyone,
just had my oil cooler seals replaced with the kit and found another fresh leak on my garage floor today! More to the right side of the engine! Cooler seals were replaced over 30 days ago!

Any ideas? Going on vacay tomorrow so I can't do anything until I get back!

2014 ML350 Bluetec
Old 07-11-2024, 09:42 PM
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2013 Mercedes GL350 Bluetec (X166) & 2019 Mercedes A220 (W177) & Retired 2008 Mercedes C300 (W204)
If right side you are referring to passenger side, check vacuum pump cover or intercooler hose for any signs of leaking. Take a look under the vehicle to see if you can see where there leak may be coming from.

Was the engine washed out as well as the under tray after the oil cooler seals were replaced? How much of a leak do you have?
Old 07-12-2024, 05:35 PM
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Originally Posted by Mikey178
If right side you are referring to passenger side, check vacuum pump cover or intercooler hose for any signs of leaking. Take a look under the vehicle to see if you can see where there leak may be coming from.

Was the engine washed out as well as the under tray after the oil cooler seals were replaced? How much of a leak do you have?
Leak is a very small one, size of my index finger print! Engine bay was not washed after cooler seals were replaced! When I get back from vacay, I'm gonna take it back in.

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