I'm about to buy an'87 190d turbo and I'm not sure if I should be worried about the oil pressure.

While I have my foot on the gas the oil pressure indicator is at 3, but when I take my foot off the gas to roll to a stop it drops between 1 and 2.

This is the part of the panel display that has a picture of an oil can with the numbers 1, 2 and 3 that the arm can point to.

Please, I need to know if I should be worried about this. Does it being a turbo have anything to do with this?
Oh, and my buddy has an '87 190d also, although, its not a turbo. When he turns his car on the indicator goes to 3 and will stay there until he turns of his car.

thanks,
ghiafreek

 

still okay and no need to concerned of. for as long as it gets to 3bar at 2000rpm.

you got worn out engine.