Originally Posted by BlackknighT
I have an 09 flexifuel and I think I remember reading in the flexifuels manual to not use any injector cleaners or additives.
My earlier comments were made in the context of a non FFV, however, some of the materials used in FFV fuel sysetms are even more robust than those used in non FFV fuel systems so, from the standpoint of damage to fuel system parts, I wouldn't think injector cleaners would be an issue.
That said, what might be a problem is solevent-based cleaners or additives and the sensor in the system that measures the ratio of ethanol to gasoline.
If that's the case, I'd ONLY use a detergent-based injector cleaner in an FFV engine because the detergents used by those cleaners have chemisty similar to the detergents in the gasoline blended with the ethanol.
Sadly, flex-fuel HHRs are a useless increase in the cost of the vehicle because the amount of locations one can buy E85 are so small. Plus running the car on E85 is more expensive because the decrease in fuel mileage is not covered by a lower fuel cost.