So recently I've acquired a 1.6 focus cmax and been trying to figure out how to get the most out of it with not much money. I have tried red-ex and similar products in the past and not really noticed any difference. HOWEVER, last week i put some Forte Advanced Gas System Formula in with my half a tank of fuel and have driven over 200 miles since and my findings are... remarkable. The idle is smoother, the throttle is more responsive and it seems to rev more happily. This all makes me a very happy boy. This does lead me on to a dilemma. Given that their fuel system cleaner works so well, I was considering using their engine flush and possibly their oil protector to help keep the old girls heart as healthy as possibly. Anyone had any experience using either/or? As I say if they work as well as the fuel system cleaner then the car will be like a new one afterwards.