The only caliper maintenance that needs to be done is when brake pads are replaced. I don't think the dealer was being truthful and he certainly didn't take the time to explain the problem and what needed to be done. Lack of communication causes a lot of problems. Even though we normally recommend a call to the automaker's Customer Service line to ask about these things, a phone call might not have helped as they often side with the dealer. The Byrnes Family Dear Byrnes Family, We recommend that you always stick strictly to the manufacturer-recommended additives.
Short cuts can, at times lead to much bigger problems.
But putting camphor balls in your gas tank sounds like a good way to clog up your system.