Any specific reason for the discount or are they just short on work? This is not written in stone, but as its a known problem Toyota extended the warranty on the DMF to 5yrs, not sure of the spcific mileage allowed, But i know to my own cost that they will not tolerate anything outside 5yrs, mine was 5yrs + 8 days old with 23000mls, and had been fully seviced 3 wks prior, I no longer use that dealer Stew