Seems everyone has favorite. I just bought a 2005 KLR and the guy was running one of the Kawasaki synthetics in it. I see threads here talking about running Rotella and other petroleum oils. Would like to service everything before I put a bunch of miles on it.
Thanks in advance...
Welcome to the forum, bigfrank!
And, welcome to KLRdom!
Kawasaki's oil recommendations (copied below) are rather loose.
Contrary to popular legend, no proscriptions against "friction modifiers," or of "energy-conserving" oils are stated (although tribal myth maintains these properties will turn your clutch/engine into a pumpkin at midnight).
A riding partner (55,000 miles on an '08), whose technical opinions I respect, has stated: The only oil issue he's ever encountered with KLRs is, running with an insufficient AMOUNT of oil (cylinder head camshaft bearing surfaces insist upon adequate oil supply).
Here's what Kawasaki says:
I run FLEET Diesel oil; Rotella T, or whatever 15W-40 is on sale; even Rotella 5W-40 synthetic when on sale (a little beyond viscosity recommendations, but . . . no known adverse effects).
Fear not; just keep your eye on the site glass, and you'll be golden.