Question about Volkswagen Passat

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1999 volts wagon passat just put new oil in it ,,,,,oil pressure i hooked a gauge up and it runs at about 45 to 50 pounds and when i stop to turn around it falls to 25 pounds and when i take back off it goes back to 50 pounds and when i coast down a big hill it also falls to 25 pounds

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  • simp_jackie Apr 24, 2010

    you might need to no this,that ifirst put 5 quarts in it ran it about 200 miles and the oil light came on and i read the book where it said that the car take 4 .3 quarts so i drained a quart out and the light went off and drove it about 20 miles and the light came back on so then i change the oil and just put 4 quarts in it and the light came back on in 20 miles and then thats when i hooked up the oil pressure gauge,, so did to much oil hurt something?or any more suggestions

  • simp_jackie Apr 24, 2010




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Hi. Due to the fact that the oil level is fine, This will indicate that there may be some sludge build up in the block, or the oil pressure switch is damaged. The more serious issue will be a failing oil pump. To isolate the issue, simply, have a oil pressure test ran on this engine. If the test indicates that the true oil pressure is optimal at idle, kindly replace the oil pressure switch. Now, if the test proves that the pressure is indeed lower than factory specifications, this will confirm that the pump is damaged. Have the pump, and oil pump screen replaced, in this case.

NOTE_ I would, also, recommend to have the engine flushed asap.

Posted on Apr 23, 2010

  • Michael Masters
    Michael Masters Apr 24, 2010

    Ok, the overfilling of the bock has damaged the oil pressure switch and pump. When you overfill, this will cause an unbelievable amount of stress on the pump and switch(sender). This in return will damage the pressure switch and overdrive the pump gear, thus preventing the proper transfer of optimal oil pressure through the sender to the actual Gauge(instrument). the necessary actions are to replace the oil pump, and replace the sender(pressure switch), as well. The screen should be ok. This Will correct the problem.

    Remember to not over fill in the future, this ca be an expensive mistake.



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