I have been told that I have a slight leak. Is this for real and haw is it fixed?

 

there is a small 0-ring for the oil level sensor...they do leak a lot, lower oil pan has to be dropped and the sensors needs to come out which is attached by torx screws..only need the 0-ring and not the whole sensor

 

to Saleen 1276
well you sound friendly - most MB garages sound now whats the word patronising useless expensive - i better not continue - ok now what if i put a mineral oil to clean out a synthetic oil during an oil change - what with the oil sensors on a ML320 '99