m104 is a good engine,use common sense and lower the thermostat,90,000 trouble free miles,and yes change trans fluid ever 30,000 miles.
Some V6s have issues with balance shafts,and harmonic balancers falling off.

__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt