Since I am using Mobil 1 oil in my 97 Formula WS6 I want the oil filler cap to match. I have heard that some people have switched caps but I cannot find the correct part number. Through a search I found GM part #12555685, but this cap that has a "insert and twist" fit and not threads like on the LT1 filler tube. Does anyone know the correct part number?
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Mobil 1 Oil Cap for the LT1
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