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FWIW, when you check the ATF level on a 96+ VW, you actually use a scan tool to check the AFT temp first, there is a specific range where you are allowed to see if the transmission is full. But an IR thermometer on the pan gets very close.
It wouldn't be that hard to do something similar on our old cars... define a temp where the fluid should be checked and just measure the pan temp.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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