Question on BMW 3-Series E36 Oil Change Sender not working after desludging

Hello, I recently had the engine desludged and the rocket cover gaskets replaced. A few weeks later during he very hot weather and after the car had been running the oil light orange came on suggesting oil was low. After the car cooled down and run in normal temperature weather the oil gauge appeared normal and was indicating what I believe to be correct a reading half- way. Now the problem is occurring a gain and even sooner in particular when the weather is hot. Tight on $ and need to know what to do,can anyone halp? BMW 320i Year 2007.

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW Oil Change

[Wayne 962]

I'm not a huge fan of the "desludging" process that some service stations do. In fact, I'm not even sure exactly what they do when they perform this procedure. I think they spray some stuff into the engine which is supposed to dissolve the oil. It may be that the oil level sender got a bit messed up during this procedure.

Unfortunately, your car doesn't have a dipstick, so you can't check the oil manually unless you actually drain it and measure what comes out. I think that the desludging process probably messed up your oil level sensor, and it needs to either be replaced or cleaned. I would try changing the oil again first though - this may help to dilute and clean the oil inside the engine and may perhaps bring the sensor back to life.

- Wayne