tell them they are full of ****.
Its halved in both years and miles for the 2nd owner. The warranty is completely (no penalty) transferrable to immediate family members. So your vehicle is probably out of warranty if is a 99, My 2000 is still in warranty till June of next year, and about 9500 more miles.
Call isuzu and ask yourself
800-255-6727
Hours: 6 am to 5 pm (PST)
Monday - Friday