Just bought it a few weeks ago and tried to contact bike shop who done the 1000km service, he has shut down...

What oil do you recommend?
mineral?
semi synthetic?
or full synthteic?
I like Castrol brand, as l use and have been using Castrol 4T mineral 15w-40 in my YZ426 for years.
Would that be ok to use on the XT660X l have???


thanks
Ash