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Old 03-30-2015, 11:26 AM
Registered User
Join Date: Mar 2014
Location: Virginia
Posts: 8
E320 W124 oil pressure gauge

I have an E320 W124 sedan, recently had the trans rebuilt and noticed that the oil pressure gauge fluctuates. It never did before the rebuild. When engine is cold gauge stays high, when the engine heats up the gauge drops to zero when I stop or get off the gas. Driving at normal speeds the gauge stays about mid point and will fluctuate as up or down as I accelerate or decelerate. Oil level is fine.
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Old 03-30-2015, 11:34 AM
WTB: 94/95 E320 Wagon
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,441
Bad oil pressure sending unit?
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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Old 03-30-2015, 11:34 AM
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Join Date: Nov 2010
Location: TX
Posts: 3,332
the gauge is run from a sensor on the oil filter tower, that sensor has failed on your engine.

In normal condition the gauge is pegged with cold oil and is in the middle with warm engine at idle, stepping on the gas will make it peg again.
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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Old 03-31-2015, 11:18 PM
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Join Date: May 2008
Location: San Mateo, CA
Posts: 84
Agree. It is a bad sending unit. Mine did the same and changed it. Now it's back to normal.
200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI
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Old 04-01-2015, 08:20 AM
Campbelljj's Avatar
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Join Date: Oct 2014
Location: Weeki Wachee FL
Posts: 129
Check your wire harness first
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