Right now I'm using Castrol 10w-40 and a K&N filter. After this oil change I'll be going to Castrol Sythetic 10w-40 and a K&N filter.
I've taken apart many engines and the ones with Castrol seem to be the best to me. I'm sold, but in reality it's personal preference. As long as you use a good name brand oil and change it often you'll be fine.
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