do gas additives for cars work and are they necessary ?
A good quality one will definitely help keep the injectors and the fuel system as a whole clean if used every once in a while. But at the same time, if you regularly use good quality gas, they have some of the same stuff in the gas that keeps those things clean too so it really depends on a couple things. If you are one to not really worry about what gas you use and always use what is cheapest and you do a lot of city driving, i would use a bottle with every oil change.
Yes gas additives are very necessary. Without the additives gas burns dirty and leaves deposits in the engine. The additives help the fuel to burn cleaner keeping your engine cleaner. Which makes for less fouled spark plugs and clogged injectors
Some do, some don't. I assume that you are talking about the ones you buy and not the ones the gas company puts in. I do put injector cleaner in occasional, but I don't know if it helps. Before I retired I made my own additive by mixing two part isopropyl alcohol and one part xylene (trade name xylol). and added one pint per fill up and it worked very well. The alcohol removed the water and both are octane enhancers. But I have found that the commerical ones sold are not worth the price. If you can obtain these chemical cheaply then go for it, but don't add to much. If it runs like a race car does not mean you should race it. A coworker destroyed his engine when he added to much xylene and ran it hard. Super octane gas can burn up an engine.
