Simples...if you use ebay it will tell you all you need ..BUT all xt660's use same oil and filter. I use 10/40 semi,something like MOTUL etc with a HI FLO 145 filter.




Again ebay for air filter's. The choices air standard/K+N/DNA..IF your planning to do any mod's then DNA filters have been shown to flow/allow more air into the engine.