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So this morning I checked my oil while I was filling up at the gas station like I sometimes do, and noticed that my oil filler cap was missing. I must have not put it on right last time I checked (around new years). It doesn't look like it's blowing oil out or anything like that, so I'm not overly worried about it (other than misc junk falling in). What I'm wondering is this something that I need to go to the dealer for a replacement, or would the cheap ones at the local auto store work? I've never lost and oil cap before so I have no idea.