Buy Berryman 2616 B-12 Chemtool Total Fuel System Clean-Up - 15 oz.

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One Caveat: I had added a bottle of the same brand's carburator and injector cleaner before using this, so you probably won't get such quick results with the first bottle.

Nevertheless, after I started driving after adding a bottle of this, within a short time, my car had a relatively smooth idle and the oil light never came on in traffic. For 5 years, the oil light would come on when idling or in traffic, no matter how clean the oil or how full the crankcase were. I learned to deal with it and manage it (more viscous oil, accelerating when possible, etc.). But since I used this, it has not come on once (except when starting, but so does the check engine light; they are on by default when the engine is not on but the car is).

Again, since I used their less potent fuel cleaner before, it probably sped up the results. But that said, at worst, that just means I would have needed 2 bottles (at most) of this stuff to have a car that can idle smoothly. It's kind of amazing.

The only time I have ever seen such noticeable results with a fuel additive was years ago when, after never having maintained by car beyond a few oil changes, I added Techron to my gas tanks and my MPG went up 3 MPG after 2 treatments (which for a van that only got 12 MPG in the city before, is a big deal).

So, if your car has engine issues, I'd definitely give this a try.

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I have been using Berryman's B-12 products for years and they have always met my expectations if not exceeded them when it comes to cleaning my vehicles' fuel systems. I recommend their products to my friends and family.

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great product ... cleaned my honda generator carburetor and it ran like new. It can be added to gas so that it continues to clean the carburetor while the generator is running.