On a Mercedes transmission, there is nothing wrong with it being in neutral. Very high RPMs in neutral will create high static pressures in the troque converter and should not be done, ie, not a good idea to repeatedly rev the hell out of your engine in nuetral for prolonged perios of time at red lights.

I remember some 80s auto ZF transmissions on some BMWs that would hold rediculous fluid pressures in neutral. This would cause internal leaks through seals if left in neutral all the time as this high pressure would damage seals. Those specific transmissions should not have been designed that way, though, at least IMHO.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record