I never found any literature on the cold mark - the factory manual tells you to fill ATF to 7mm from the tip of the dipstick when dead cold. Which is exactly the edge of the curled pointer on the dipstick.

Everytime I follow that I never have to futz with it again.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)