Just picked up a 300TD '85 and it has the self-leveling deal. I have a buddy and his has a slow leak. If he turns the engine off while fueling, he notices the rear end sinking. Mine is good so far.
In addition, both of us have manual sun-roof levers. Not as convenient as my '84 power one but feels nuclear proof.

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed