300 sd oil pressure - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 04-04-2004, 12:01 PM Thread Starter
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Date registered: Apr 2004
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300 sd oil pressure

Oil pressure at guage in drive reads about half way up when moving with foot on accelerator max's out . Just wondering if that is normal I just got it a couple days ago its a 1983 when cold it stays maxed out but i have noticed a gradual lowering of pressure when it warms up . I dont understand the guage except to say its about at the 2 when sitting in drive idleing .
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post #2 of 2 (permalink) Old 04-04-2004, 02:07 PM
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RE: 300 sd oil pressure

Those are measurements in bar pressure as opposed to psi – when cold with the engine at any speed the pressure should be at three bars. After the engine reaches operating temp, 80 to 85 degrees C, when the oil is warm and thins out, the pressure should be three bars under load and can drop to 1.75 to 2 bars when at idle. If the pressure drops to below one bar or does not peg out under load, have it checked by a mechanic. It could be as minor as a faulty gauge or as major as a bad oil pump.

Also, post in the w126 forum from now on and welcome.
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