I'm soooo sick of these m/c oil wives' tales.....
"Energy Conserving" oils are your 20wt and 30wt oils with an HTHS # under 3.5
THEY HAVE THE SAME ADDITIVES AS 40WT OR 50WT OILS....
PCMO's have LESS additives than m/c oils, so why is everyone worried about them NOT working with a wet clutch?
If anything I'd think that you might want to add some VSOT.
Originally Posted By: 1sttruck
Production motorcycle, consumer oils...
http://www.r6messagenet.com/forums/showthread.php?t=41403
Welcome to The R6 Messagenet.
The largest resource for the Yamaha YZF-R6 and YZF-R6S
Motor Oils
If you read the manual you will notice it says to use Non-EC (energy conserving) oils only. This is what you should look for on the back of the oil bottle, it will not say Energy Conserving on the bottom. Because your motorcycle has a wet clutch, and is actually partially submerged in the oil, some say your clutch will slip. Debates rage on as to whether this is a needed concern, or just a marketing ploy playing on your fears, to get you to spend extra money for motorcycle specific oils.
15w50, 10w40, 5w30 and 5w20 are the most common oils used in our bikes. Brands are generally personal preference, but most here will recommend Mobil1. Mobil1's "Extended Life" 15w50 (Red Cap Replacement) motor oil is a favorite of many, and their new "Truck and SUV" 5w30 is also a great oil, free of any friction modifiers (EC rating).