neutra is a cleaner and fuel stabilizer and a fuel system lube. works great in any small engine from lawnmowers to generators, that sometimes get stored for a while. But great for any car or truck. I use soy ultra in my pickup which i drive daily for cleaning and small mpg gain. MY LITTLE car sat for two years while I was ,,,,AWAY,,,,, but it had ahalf tank of gas and full bottle of neutra added before I left. I changed battery when I came home and car started ok,,little rough for ten min then runs like new for 47,000 miles. neutra kept it clean and fuel good.