I know that the manual says that the engine should be running, the temp at 80C and parked on level ground....

I just had the trans fluid and filter changed but the shop over filled it slightly... (2 mm above max mark)

I already drained some fluid out... but I want to make sure I am doing this correctly...

When I check the fluid, the car should be on level ground, be idling, and the temp should be at 80C for the readings to be accurate (says the manual)...

I took my car around the block for 10 minutes... temp reads 80C...
I drive into the garage and put it in P gear... pop the hood and I wait for 2 minutes (exactly)... then I remove the dipstick, clean with lintfree cloth and reinsert completely, but do not lock it in.... then I remove and check...

I am currently reading way below the min mark, the level seems to be about 3 mm about the hook area?

When I stop the engine and then check after maybe 5 minutes, the fluid level is way above the max mark....

I am sooooo confused...

Should I add fluid or am I doing this all wrong?

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)