I have a D2 40 with 130S drive and it keeps blowing oil
out the fill cap I guess, every time I check there is oil
all over, maybe 100 or 200 ml but the level does not seem to drop much, I am using multigrade engine
oil as recommended and the oil is clean, no water
. I may well have overfilled it a few years back but the level is correct now, any ideas?