My 87 300E leaks ATF when parked for a few days. As suggested by dpkreuze I put a clean piece of card board under it and didn't use the car for a few days, when I moved the car I noticed the red puddle. I got under there and saw ATF dripping from the torque converter.

I took it to the indy and he said that it was the front seal and that the more I use the car the less it would leak and the longer it was not used the larger the ATF puddle.

I was given an estimate of $1k for labor only (10 Hour job) to remove the trans and replace the seals plus "O" rings while they were at it.

I haven't done anything yet, I just use the car and monitor the ATF consumption.

I am really considering doing this myself with the information from others here that have done it.

Good Luck with yours!!!

__________________
GC
1987 300E 104K
1984 300CD 112k R.I.P