Between cars, tractors, trucks, mowers, generators, boats etc after a period of time I end up with a bunch a partial jugs and quarts of oils of various viscosities. I used to have a 2000 Lexus LX470 that one of my daughters drove and progressively smashed, and I would use this vehicle as the repository for an oil salad of left overs. It had an 8 quart sump. The best one was 4 quarts of Mercury Marine 25W40, several partial bottles of M1 0w20 totaling about a quart, a quart of Super Tech 15w40 dino, a quart of PYB yellow bottle 10w30, and two partial quarts of M1 0w40. Yummy oil salad