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Old 08-07-2004, 01:57 AM
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Join Date: Mar 2004
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Oil Pressure Guage

1989 560SEL

My oil pressure guage seems to be malfunctioning. It reads 0 and does not seem to register any pressure. The oil warning light does not come on.

Should I take it into a mechanic or is there a way that I may confirm that it is a defective guage or sensor.

Thank you in advance for any assistance.

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Old 08-07-2004, 02:05 AM
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STOP driving the car period. Confirm that the oil pressure gauge is bad and that you do have adequate oil pressure bfore you drive it agiain. Or...keep driving and when the engine is turned into a large useless chunk of metal you can help put the child of a Mercedes mechanic through college. Your choice.
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Old 08-07-2004, 02:54 AM
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The oil warning light is connected to an oil level sensor, not an oil pressure sensor.

Check the connection to the oil pressure sender at the back end of the intake manifold. You might have knocked off the wire or something trivial like that.

Having the gauge read zero is frightening but if you don't hear lifters clacking then it's probably a bad gauge rather than poor oil pressure. It's your call whether to drive it a shop. Chris is right that starting the engine one more time is at least a $5000 gamble.

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Old 08-07-2004, 01:54 PM
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My boss's 560SEL oil pressure gauge is kinda wacky too. Sometimes it always reads 3+bar and somestimes goes to 2bar at idle and slowly drops to 0 while still at 750rpm. The car runs VERY strong and makes no noises. I've never delt with an MB V8 so I'm curious to see the fix.
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Old 08-07-2004, 03:57 PM
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Join Date: Mar 2004
Posts: 39
Oil Pressure Guage

I have reviewed some of the other posts which suggested unscrewing the oil cap and confirming whether there is any oil n the valves/cam area. Would this be a prudent course of action?

Thank you.


Would I be able to confirm the location of the oil pressure sensor?
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Old 08-07-2004, 07:19 PM
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Location: Milford, CT
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Putting a mechanical guage on would be what I would do. The guage is their for a reason I know people who have ruined $50k marine diesel's because they didn't beleive their guages!

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