Hi, I have done many oil changes before. Just not many on quads. My friend has a 1986 honda fourtrax 250 2wd. He is letting me use it for ice fishing, so I told him I would change it. Plus I said I would get some fresh gas in it. The gas smelled a few months old. The oil is dark black, and is ready to be changed. Does this take regular 10w40 atv oil? SOunds right to me. You need atv oil for the certain additives. Does anyone else like these quads? Nice and simple if you ask me. Even works to pack light and use for getting on the lake and ice fishing. Changing the oil for him is the least I can do with him letting me use it and all. Makes sence right?