Anyone have any ideas on oil for my 93 SECA II? Has about 17,000 miles on it. Last oil change I put in Valvoline MC oil but that stuff is [censored] expensive. I was thinking along the lines of Rotella but the manual calls for 20w-40 and Rotella only comes in 15w-40. Actually, yamaha stopped making 20w-40 so I'd have to go with a 20w-50 anyway. Does it really even matter? The one thing I won't do is run synthetic. I did try it once and the clutch was was way too slippery. Any other oil recommendations or comments are welcome. Good or bad. Thanks!!