Chris, I changed the oil today and it actually took about 5.5 quarts to bring it up the full mark. The filter is a NAPA Gold 1172 and the oil is filled through the oil dipstick tube. It actually went in fast which surprised me. The guy at NAPA when I bought the filter was familiar with the model of tractor and where the oil was filled. Tractor Supply did not have the manual so it was good NAPA and you could help. Thanks, Rich