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Old 05-07-2003, 11:42 PM
Benz Fanatic
Join Date: Apr 2003
Posts: 31
Oil Pressure

The oil pressure in my W140 300SE pumps up immediately to the 3 and never drops below, even at operating temp and idle. None of the other benzes I have had have ever done this. Is this something wrong or normal? Most of them hovered between 1 and 2 at idle and operating temp.
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Old 05-08-2003, 08:11 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Sounds like a defective sending unit. ON a "hot" M104 engine at idle w/A-C on normal pressure should be around 1 (about 15psi).
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Old 05-08-2003, 10:49 AM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Mine went "bad" on my 300E about a month ago...the needle would peg at the "3" position and remain there until I shut off the ignition. In fact, this would occur when I would first turn the key in the ignition...and not start the car!

I replaced the sender ($70 at FastLane and a five-minute install) and that corrected the problem.
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