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I have a BMW 740IL and it has been a great car for me. I have put 80k on the 60k it had in miles since I bought it. I have noticed that when slowing down very quickly when it was nearing or over time for an oil change that the warning stop low oil pressure readout came on. In the past I could reset it, go get an oil change and it would fix the problem. This last time I went and checked the oil as I was told I have a very slow leak in the oilpan. I actually overfilled the oil by just a little and then when driving home it ran a little rough, but the low oil pressure light came on over and over. It ran rough and actually stalled a couple times with another indicator "transmission missed shift " or something like that. I towed it home 1.6 miles and then restarted it. I did an oil / filter change still run rough! !

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  • tomrebar60 Feb 17, 2010

    I understand the oil pressure sending switch could be the problem. would it run rough though with that issue?? Does the car try to compensate in some way for the possible misreading??

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Remember this is not a warning about oil level, that is another system, this is the engine oil pressure warning, this means the oil pressure being read by the oil pressure sending unit is below about 5-10 pounds per square inch or PSI, at this low of pressure the engine bearings can be damaged as well as other components like the valve train parts, the thing to do here is have the oil pressure tested by a shop with a special calibrated mechanical test gauge, the one in the car is electronic, u may just have a defective oil pressure sending unit, but take no chances, if the pressure is really low engine damage will occur soon, get the oil pressure PSI checked ASAP, if it is ok then the shop will replace the oil pressure sending unit on the engine, about a $100 part.

Posted on Feb 17, 2010

  • Marvin
    Marvin Feb 17, 2010

    low oil pressure would not make it run rough, to sort that out you need to have electronic engine control test done to see if any fault codes are in the system, this is both the active and the passive tests.

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