Better fuel oil?
 

Can you give me the better caracristics of the fuel oil v/s price.

I need to know if I have to use Syn or mineral mix with the fuel.
And what kinde of mineral is the best for use it in that mix.

Here is too expencive the Synt one ($30 the bottle)
and the mineral $2 so I can use more oil mix ? like 50/1

take in care that I don't have the oil mettering , in case it is a fd3s

Regular old 2-stroke mineral oil is fine. A 50:1 ratio is a little rich, though. Most people who no longer run an oil metering pump mix it at 1oz per gallon which is a 128:1 ratio.