Fuel Additive Question

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It depends on the additives and how much extra you added.

My guess is that you are just wasting money, but will do no damage if you just add too much additive to a tankful of fuel.

Some years ago a mechanic friend of mine always "doubled up" on the fuel additives intended to clean fuel injectors. He claims he got better results on his customers cars by adding twice the recommended additives to the fuel.

Personally I would not recommend deliberately straying from the manufacturers recommendations.

There are fuel additives to clean, most of them are detergent based.
Berryman's B-12 Chemtool is solvent based and a bit stronger.
I have gone double dose with that....but would not recommend more than that.

There are fuel additives to lubricate.....often called "Upper Cylinder Lube" (UCL).

Some do both, lubricate AND clean.

Fuel additives that claim to boost your fuel economy do little more than lighten your wallet.
Now.....fuel system cleaners "can" boost fuel economy by cleaning dirty fuel injectors, etc.
However, they don't save you fuel beyond that.....so using them to clean things up is a good preventative maintenance program, or to clean up dirty fuel injectors (correct a known issue) is also good.

I often recommend a fuel system cleaner when someone has a issue.....like misfire before they spend money on expensive things that they don't know for sure are bad.

NO fuel system cleaner or cleaner that you spray into the intake will do anything to clean clogged EGR ports.
The only way to clean EGR ports is to remove the upper intake manifold at to clean them manually.

There are fuel additives to clean, most of them are detergent based.
Berryman's B-12 Chemtool is solvent based and a bit stronger.
I have gone double dose with that....but would not recommend more than that.

There are fuel additives to lubricate.....often called "Upper Cylinder Lube" (UCL).

Some do both, lubricate AND clean.

Fuel additives that claim to boost your fuel economy do little more than lighten your wallet.
Now.....fuel system cleaners "can" boost fuel economy by cleaning dirty fuel injectors, etc.
However, they don't save you fuel beyond that.....so using them to clean things up is a good preventative maintenance program, or to clean up dirty fuel injectors (correct a known issue) is also good.

I often recommend a fuel system cleaner when someone has a issue.....like misfire before they spend money on expensive things that they don't know for sure are bad.

NO fuel system cleaner or cleaner that you spray into the intake will do anything to clean clogged EGR ports.
The only way to clean EGR ports is to remove the upper intake manifold at to clean them manually.


Okay, answer still not given. I'm looking for the answer to "Will it wreck the engine, or damage it, and how can I tell"?

An answer was given, just not to the one that you had in your brain. If you are looking for a specific answer to a specific question then you should first ask it. I do believe both answers were sufficient to even answer your new question, however. Did you pour 2+ containers into an empty tank, full tank, half full tank? Usually the only damage that would occur from adding too much fuel additive is if you have old rubber fuel lines, which is unlikely. Basically the alcohol in the additives would eat away at the rubber hoses and would end up clogging up your fuel filter, injectors, and possibly your combustion chamber if it makes it that far. The higher concentration of chemicals, the worse the reaction and thus end result. But again, this is rather moot as your lines should be the same as mine which are metal. I really doubt that it would cause any damage unless you ran it with a tank full of additive as it is mostly just a higher octane fuel.

Okay, answer still not given. I'm looking for the answer to "Will it wreck the engine, or damage it, and how can I tell"?


In my opinion no it will not hurt the engine. The anitfreeze in the engine has done more damage.

I guess that my response would be, how much of what additive?
That would determine a more specific answer.