I got a slow oil leak from pumpkin in my 1987 240 wagon. The leak seems to be originating from speedometer sensor (I have poor internet, but I will try to post pictures). Any ideas how to fix it? Searching on the internet didn't really help, and Haynes manual does not mention speedometer sensor at all...

 

if the leak is from within the sensor, replace the sensor, if its around the threads, remove it, clean up the threads, and reinstall with some sealant of some sort.