The most common places for leaks are:
1. the oil pressure sensor, which is close to the oil filter, between the filter and the alternator (looks like a spark plug screwed into the block, with a single wire coming out). Replace it immediately, because it can suddenly dump all the oil out the engine.
2. Valve cover gaskets. Oil slowly leaks down the block, and into the spark plug wells.
3. Oil cooler O ring. Just above the oil filter is the oil cooler.
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