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Wouldn't your choice of grades eg 10/40 or 20/50 etc depend on where you live ie, close to the Equator or close to Canada? So long as the brand used was a good quality but then how would you know other than watching TV ads!!
S'pose if all else fails, one could go by the mftr's recomendation!
Me, I just use the same oil I use in all our road bikes, that is Motul 3000 4T Mineral or Motul 5100 synthetic for the HP motors such as the high reving off-road enduro bikes. Been using the 3000 for years and generally sell bikes at up to 130,000 km (80,000m). Never had a problem.
Davo
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