I took my car to the dealership today to get a 60k tuneup. I got the oil+filter, air filter, sparks, radiator fluid, transmission and several other stuffs changed.

Half way through, serviceman called me and told me I have dirty injectors and they need to be cleaned for about $200.

Is that a reasonable price? He also said something else needs to be cleaned too, I think the throttle if I did not mishear him.

So, can I buy a fuel injector cleaner like Seafoam or Lucas to do the job? I am getting mix recommendations because some said cleaners does not work and other said they do.

Finally, why do injector gets dirty? If I start using Chevron instead of Shell, will that help?