I'm somewhat confused here. I called two yamaha dealers and they said to refill with just over 3 qts of oil with a filter change. On-line here, there is a posting that states roughly 2.3 qts with just an oil change, about 2.6 qts with oil and filter and a total capacity of 3.1 qts. I put in 3.1 qts with a filter change. Should I drain about 1/2 a quart?