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Thanks for the tip x-rad! I'll give it a try and see what happens. My sensor has an all metal body.

It seems to be a small leak but some of the oil is falling onto the exhaust tube directly below so not sure how much is burning off... The sensor I have is installed along with what appears to be a sleeve in the orginal sensor mounting hole on the side of the gearbox.

Is there a way to stop this from the outside such as replacing a seal?