318i M10 cars did not have the panel. I think that 84 325e had it, but can't remember. The S38 has no provision for an oil level sensor in the pan. Not really enough room. If you add a resistor, you might be able to fool the check control.
I am keeping my M3 mostly stock, so I am not going to wire in resistors. I really rather not mess up the wiring! Although I know it would be easy to do. I had to repair a lot of wiring in my 318i b/c the previous owner had installed a CD changer and after market alarm. I did a lot of soldering. I would rather check my oil by the dip stick anyway! Proof Positive! I have an M3 with the S14 motor. Now the S38 is an awesome motor, Botond you should swap that into your E30! GR
Now I am quoting myself. Why can BMW make an oil level sensor that works in the 1980s but not now! I know a lot of folks are having issue with the oil level senor on their new Bimmers and they don't have a dip stick to confirm. GR