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4

This is normal behavior - When the engine is not running, there is no oil pressure, so when the ignition is turned on, that light will be on. As Larry says, this functions as a bulb test so that you know that it is working. When you start the engine, the oil is pumped round, the pressure goes up and the light goes out.


3

This vehicle in your example photo is a really good example for when not to use an oil drain valve. Notice the heavy lugs on the all terrain tires? I am not sure if this vehicle is 4 wheel drive, but the tires indicate it the owner plans on driving on other than smooth paved highways. A drain valve on an off road vehicle, is an invitation for a long walk ...


2

It sounds like you are getting drain back. When your engine sits without running for a period of time, most all of the oil in the oil passages drains back into the crank case. When you restart your engine, the oil has to be brought from the pan back up into the oil passages, then you see your oil pressure raise. Since I don't know which year your BMW is, I ...



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