Timing belt replacement interval - 2000 Hyundai Sonata

For both the 4 cylinder and 6 cylinder Hyundai Sonata engines, it is every 60,000 miles. Your engine is an interference engine, so if it breaks the timing belt, it will destroy the engine. Consequently, make sure you get it replaced at 60K miles!

My rule of thumb for Timing belts:
replace at 60,000 miles, and every 40,000 miles thereafter. Having said that, I often let
cars go until the timing belt starts showing signs of wear (usually every 50K - 75K miles)

But www.autozone.com (register free at www.autozone.com) is recommending for your
car driving in "severe driving conditions" (aka normal stop-start driving) that your 2000 Sonata
have:
60,000 miles - replace
90,000 miles - inspect for wear
120,000 miles - replace
150,000 miles - inspect for wear

The 155 page owners manual (I found one at the link below - you may prefer to try Hyundai)
makes no mention of the timing belt at all.

http://www.scribd.com/doc/29113477/2000-Hyundai-Sonata-Owners-Manual