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How Often Should My Injectors Be Cleaned
For peak performance, maintenance of your fuel injectors should be performed every 15,000 miles or so. Also think about cleaning your fuel injectors when you have a miss, or a loss of performance. Start by using a good injector cleaner added to your gasoline, such as Ethanol Defender. Doing this will help keep  your injectors cleaned while driving. Injectors tend to build up deposits in the very small injector discharges.

Can Too Much Injector Cleaner Be Used
Yes, always follow the advise of the manufacture of the injector cleaner product. For example Ethanol Defender's instructions says to use 2 oz per 10 gals of gas.
Don't use anymore than that. Too much cleaner can cause excessive engine wear over time.

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