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B2 piston seal? Upper passenger side, no pressure in it in fourth, but there is at low speed in other gears.
I've seen a similar problem with the low/revers band servo on Borg Warner (Ford) automatics -- blows fluid like crazy hot while stopped since the servo is pressurized in 1st or reverse, usually doesn't leak as much cold, seal on the cover shot. Leak stops once the pressure is off the servo. It leaves a diagnostic trail -- puddle under the car when you stop and a trail until the car shifts into second, then a few drips. On the MB, it might start after the car moves off, the stop when it changes gear.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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