Q: how do you test your oil sending unit on a 2002 saturn L300 on 2002 Saturn L300

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2002 Saturn L300 leaking oil from either the oilsending unit or the oil filter adapter seal.
(1) Answer
Clean off the area with brake clean and first pinpoint the leak, then if it is the oil sender, replace it, don't mess around, because they can fail and cause you BUY a new engine. Same with the oil filter adapter seal.
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