Edmunds Answers



  • stephen987 10/08/09 11:44 pm PST

    Different brands of fuel injection cleaner have different molecular weights, so there is no single answer that will work properly for all brands. Instead, you should follow the directions on the bottle as carefully as possible.

    And NEVER add oil to your gas tank!

  • tony78 10/09/09 1:02 am PST

    Read the bottle, most say 1 bottle for twenty gallons.

    If you have a 20 gallon tank, then use 1 bottle.

    If you have a 10 gallon tank use 1 / 2 bottle.

    It does not matter if you put the injector cleaner in first, or the gas in first.

    Good quality gasolines from distributers such as Shell, Chevron, Unocal, BP, Amocco and others contain detergents that clean your fuel system.

    Budget priced or thrifty gasolines may not have these same detergents.

    If you want to save money, but can't afford the higher quality gasolines all of the time ?

    Do the 5+1, five tanks of thrifty and then 1 tank of the good stuff, this way you will be cleaning your fuel system at regular intervals and it won't break the bank.

    I agree with the first answer, no oil in the gas tank.

  • Stever@Edmunds 10/09/09 1:42 am PST

    The EPA sets minimum requirements for all gasoline to be treated with detergents and deposit control additives. Ordinarily you shouldn't need any extra cleaners or additives. (link)

    But if use something, follow the instructions on the bottle. Chevron says to put a bottle of Techron Concentrate in a full tank of gas for example. But they don't define what a full tank is on their web page.

  • tazorac 10/09/09 2:07 am PST

    Thanks I may try the 5/1 method

  • neil16 10/09/09 10:02 am PST

    if you read the instructions on the container it will give you the recommendations for use. Usually you are supposed to pour it in before a fill, then fill up. It is meant to work over the entire tank of fuel. The reason for putting it in before a fill is that it mixes it fully. If you run it on 1/2 a tank, it will be more concentrated, but you would only want to do that if you had serious injector issues as it can possibly affect you catalytic converter. If there ever happens to be an issue from it's use and it was not used according to the instructions you would be holding the bag yourself and completely responsible. Ask your auto parts provider which is the best for you as there are many out there, all designed for specific results.


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