Synthetic oil

#2
I use Mobil 1 in all my vehicles and it does make a difference. I havnt used it in any small engines. You would use the same weight as dino oil and no you dont have to flush the old oil it all mixes
 

minidragbike

Supporting Speed Nut!
#3
Synthetic is what my buddy and I was running. But we don't have a favorite brand. Just the cheapest one works, and I like to use 20-40 weight.
 
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