Does anyone use amsoil synthetic in their 12a. I use it religiously in my other cars, and I just inherited my old mans 82 RX7 but heard some rumors that syn is bad. I have check the old posts and never really confirmed ya or na?

Thanks

 

Amsoil will work fine.

 

I do in my race engines. 20/50 racing, and Dominator 2-cycle for pre-mix. In my street 7's I run dino Valvoline 20/50 racing in summer and 10/30 in winter. I also run Amsoil in my boat motor. (GMC V8)
They are awesome products, but in reality not apprecialbly better than Royal Purple and Red Line. I would choose these products over Mobil 1, but then a lot of the racers I know use Mobil 1 and love it.