Automatic transmission fluid does not burn off like oil, nor does it evaporate, which means that low transmission fluid is caused by one of two things. … If the fluid reservoir is not properly filled during service it will lead to major transmission issues.
Can engine oil leak into auto transmission?
If you’ve got a rear main seal leak you will have oil dripping off either your engine oil pan or the front of your transmission called the bell housing. … For example, a leaking oil pan gasket or even a leaking valve cover gasket can drip down your engine and cause oil drips in this location.