Just completed my first service. Did it all myself as usual with all my bikes. Used Suzuki 10W40 oil and 90 Weight Gear Oil. 3.8 Liters put me a smidge under the full line with bike upright after 15/3 check. Reused crush washers on drain plugs as I have done with every bike over the last 35 yrs. No leaks. The key is to make sure your plug threads are clean of any debris. No cross thread. Screw by hand all the way in and just "snug" the bolt. No need to muscle up on it at all. Oil filter was tight from factory but, factory filter cap wrench and flat ratchet wrench worked like a charm. Hand tighten filter and then snug with filter wrench, no leaks as per usual. The key is to make sure everything you screw in or on has clean threads and face and you will not have leaks.