Gearbox cleaned .. took for 30mile drive ..
back on ramp .. seems to be coming from dipstick tube.
Having o ring changed .
Anybody heard of that ?
Not on a Coupe, but I have had it happen on a classic 500, it was dripping onto the exhaust and created a lot of smoke, again, only when warm. Trial and error with a couple of different new o-rings solved the problem.
Hopefully you have found the cause of the leak.