I've gone from using Bel-Ray in the transmission to AMSOIL MCV in all three holes for no other reason than convenience. I buy the MCV by the case. It comes directly to my door.........just like our dog food does (makes a great topic for this term's supply chain management research paper), and it costs about $7.00 a quart. I've developed my own system to get the old oil out, since I now change all three every 3K. Drain all three first. As for the oil filter, I slide a plastic Walmart bag under the filter and place a gallon sized ziplock bag around the filter. I break torque with the oil filter wrench, then spin it off through the ziplock. 90% of the oil goes into the ziplock with the filter, and the remaining 10% is caught by the Walmart bag. It has been a long time since I've goofed up and gotten oil on the bike after a filter removal. Using just one oil means I only carry one oil in the saddlebag during trips. Huge space saver.