EGR tube replacement

[BlackVX]

I brought my VX to the dealer this morning and it needs a new EGR Tube. Total cost $500.

I took the extendented warranty when I purchased the vehicle. It covers the EGR part only.... So it's going to cost $400 for the labor that includes cleaning the carbon on the injectors that are apparently really plugged. I have 55k on my 99 VX. The dealer told that I should have the injectors flushed every 20k. I never read about that from the other VX owners. They did tell me the same story the first year I purchased the vehicle back in 99.

What could cause to plug the injectors like that? I put injectors cleaning fluid from Chevron every 3000 miles.

Anyones faced the same problem or could comment on this?

Thanks,

Michael