I had my truck in for a simple oil change recently and when I went to pick it up they were trying to tell me that my exhaust system was also dirty and needed cleaned and that my brake fluid was to old and dirty and needed flushed. All of this could be done for the super low price of about $230 or something. I declined but am having some second thoughts on the brake fluid. The level is good and the color looks fine, but it is 5 years old now. Is it possible that moisture or anything could build in it over several years? What do you all think?