Hello evereyone I had a problem with my s4 and I solved it with my brother's help, it was a timing issue and a dirty injector, the engine is not blown =)
now I'm doing a tune-up but I don't know what oil to use, I heard theres some problems using synthetic oil or something like that, any suggestions fellas?

 

in the FAQ it mentions about oils if you are not premixing you should not use synthetic because of how it burns in the compbustion camber(i think).. there are many different opinions on oils you should search theres a munch a arguements on here

 

it should be under FAQ. most people on the forums use either castrol 20/50 or castrol 10/30. rotary engines inject oil either through the intake manifold (earlier models) or oil injectors (later models) into the combustn chamber. synthetic does not burn clean and leaves behind deposits. unless you block off your OMP and pre-mix they say do not run synthetic

 

I think pretty much everybody runs 20w-50 in the summer months because it is thicker. As for what brand, Castrol GTX is all that i use.