Hey now, good feedback. I'll try both. Seems that when I check it cold I get a clear reading, just about like checking the crankcase. The ambiguity of the warm, running, check gets annoying. But I figured it had to be the low side. OTOH, the sanction against overfilling is often heard.

This is my first automatic daily driver in a long time FWIW. I'm not exactly sure what the penalty for overfilling is. I know it causes foaming, what I don't know, does that cause slippage and annoyance, or damage?

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K