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^ Open up your oil cap and look inside, you will see a "Timing Chain". They had initially reverted back some time ago to timing belts for 2 reasons as TacoGuy said: 1) Noise...belt is quieter than a chain, 2) Cost..belt is cheaper than a chain. However; the old 22R engine that Toyota used in the 80's had a timing chain that had plastic chain dampeners that would break if you didn't used a oil filter with a check valve built in;resulting in a chain replacement. Luckily, most quality oil filters now do have check valves built in. A chain is definately better than a belt IMO which has to be replaced every 60,000 miles or so.
 
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