Hello. Which grade of oil should i be using in the xtx??

Thanks

10/40
Motul 5100 or Yamalube "same thing"

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...

Thank you

I used to buy Motul 5100 10w40 but last change i used BEL RAY THUMPER 15W50 as its was said on the site....
Does anyone have any opinion on that oil???

You need to ensure that whatever MAKE of oil u use (Castrol or whatever) you use the correct spec and grade of oil, as specified by the makers of the engine. In the XT660 the makers suggest a synthetic oil and a 10/40 grade, and it should be approved by JAPO (Japanese group of manufacturers). This ensures that the oil is approved my the group of Japanese motorcycle makers so for instance the viscosity etc is ok and the oil does not interfere with the clutch. OK???? Ciao xxx ps I use either Castrol or similar.

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....