Mercury - Quicksilver 25W-40 Oil Change Kit Oil Change Kit 25W-40 Mineral Oil 8M0169542. Overview. There is a certain kind of calm that comes when you button up an oil change and know everything in the pan is right. No guessing, no mixing brands, no wondering if you grabbed the wrong filter. This Mercury Marine part takes all that second-guessing out of the picture. The Quicksilver 25W-40 Oil Change Kit for Mercury L4 Verado outboards packs what you need in one box, so you can focus on the boat,