Hi,
Chances are the fluid is making it up into the tube. Try this and let me know if it helps. Spray it off really well with something like brake cleaner and wipe it down. Then try to see if you get an even reading.
I attached the directions from my manual for checking the fluid. Take a look through them. It indicates it must be checked within 60 to 90 seconds after turning the engine off. It sounds like you already know that, but figured I would add them for you.
Let me know if this helps.
Take care,
Joe
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Wednesday, December 6th, 2023 AT 8:32 PM