I wish to check the transmission fluid level on my 1999 R129 SL500. It has a 722.624 transmission. I have ordered the special tool and parts from the dealer. I understand I should check the level at 25 deg C and again at 80 deg C. My questions are simple and probably stupid:

1. Do I check the fluid level with the engine running?
2. In what position should the transmission selector lever be when I check the level.

I have assumed that should I check the level at 25 deg C with the engine off and the transmission in P. I also assume that I should check the level at 80 deg C with the engine off and selector in P, and then check it again with the engine running and the car in P.

Thanks in advance.

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190