Senior VR Member
Join Date: Jul 2008
Location: Second Star to the right, then straight on till morning.
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Rotella T is a good, inexpensive alternative to more expensive Motorcycle specific oil. But it has a drawback in that it is not formulated to withstand the massive molecular shearing that occurs in the shared bath transmission of the bike. The base oil viscosity degrades quickly as you ride and you end up with a 'thinner' oil than what went in the crank case. Your service interval using that particular oil will be shorter, meaning you'll end up changing the oil twice as often. Any savings realized will be offset by the more frequent service intervals.
As for oil weight? That is entirely your preference. 10w40 is recommended, but you can safely run 15w40, 15w50, 20w50 in the same bike. Brand is generally irrelevant so long as you purchase oil formulated for motorcycle use (JASO MA/MA2).
Enjoy the ride.
Current Bikes -->
-1969 Indian MX125 -10-2009 to Present
-2014 Honda CTX1300 - 05-2015 to Present
Past Bikes ----->
-1973 Yamaha RD350
-1991 Harley Sportster 883 XL
-2000 Yamaha XV125
-2003 Piaggio Fly
-2004 Suzuki LS650 - 04-2005 to 07-2008
-2005 Boulevard C50 - 07-2008 to 5-2012
-2012 Vulcan 900 - 05-2012 to 05-2015
-2008 Yamaha FZ6 - 11-2008 to 04-2017
-2006 Star Virago - 05-2011 to 06-2017