Mazda MPV seal injectors‏
 

I have a MPV (11 horse power with 100kw) built in 2004 and has 91,123km. I have always taken very good care of the car with attention to its maintenance which has always been conducted at the official Mazda dealer where we purchased this new vehicle. I have now been informed from the dealer that the seals of the injectors must be replaced. From your experience is this correct with the amount of km?
Thank you!