Hi All,

I have a pretty clean 82 240D auto with 172K miles on it. Drives very nicely and the trans is in good shape and has actually had regular fluid changes.

I recently switched to a synthetic ATF in hopes that it would clean up the cold weather shifting performance on chilly mornings. The good news is that is has.

The bad news is that there seems to be a VERY small leak from the front main seal. It's actually hard for me to tell because it does not leak when the motor is running but appears to leak over night. Leaves a spot about the diameter of a tennis ball.

I would hate to pull the trans out to fix a leak this small and don't mind topping off now and then but given that this is my wifes daily, I do want to air on the side of caution as I know she is not vigilant of leaks, and fluids get checked on when I check them bi weekly.

Has anyone had any luck with additives that perhaps swell the seals a bit?

Not looking for magic in a bottle here, just hoping I might slow this lil leak down.