OM642 oil pressure, 2015 GL350 - MBWorld.org Forums

Mar 30, 2026 | 10:24 PM

olesouthernboy

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Member

Joined: Oct 2011

Posts: 105

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From: SC

2015 GL350, 2013 GL350, 2002 ML320, 1983 E300TD-D

OM642 oil pressure, 2015 GL350

Just thought I’d share a few pics. I bought an oil filter cap off of Amazon, drilled a hole in it and screwed an inexpensive 1/8” gauge in it. Glad to say no leaks. I have a 2013 with 300k plus and a 2015 with 135k. Both SUV’s oil pressure readings were the same. I took the reading with an oil temp at 195F (for the idle & 2k rpm) give or take a few degrees. For the neutral WOT the oil temp
was a little low like, 165F.

Hit idle - 21 psi
2,000 - ~70 psi
2,900 - around 110 psi (not quite up to temp yet)

2,000

Apr 6, 2026 | 07:19 PM

CaliBenzDriver

Out Of Control!!

Joined: Apr 2019

Posts: 11,921

Likes: 6,769

From: Silicon Valley

W212 MY'14 M276-3.5NA @75kMi

Quote:

Originally Posted by olesouthernboy

Just thought I’d share a few pics. I bought an oil filter cap off of Amazon, drilled a hole in it and screwed an inexpensive 1/8” gauge in it. Glad to say no leaks. I have a 2013 with 300k plus and a 2015 with 135k. Both SUV’s oil pressure readings were the same. I took the reading with an oil temp at 195F (for the idle & 2k rpm) give or take a few degrees. For the neutral WOT the oil temp
was a little low like, 165F.

Hot oil pressures:
700.R - ~21 psi
2,000.R - ~70 psi
2,900.R - ~ 110 psi

These are nice available pump pressure that can help spray cool the pistons.

Particularly important at driving Rpm (1500 to 2500R).

110Psi is a high pressure... is this pump Max ??

Last edited by CaliBenzDriver; Apr 6, 2026 at 07:21 PM.