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The company says heat and pressure can build up in the transmission, expelling fluid from the dipstick tube.

Eventually, I found the dipstick which reads nothing.

Silva jumped right into the preflight inspection, calculating the fuel levels with a dipstick.

The task of periodically checking the liquids was typically carried out by a young Russian who climbed on top of the tanks with a dipstick.

"If you are relying on dipstick testing and the patients has symptoms of a UTI, you cannot rule out the possibility of false negative test," he says.