89 Coupe Deville Questions, help please?

I would think if the car was well cared for it wouldn't need a timing chain. A serpentine belt should be changed around 60,000 miles. And coolant change about every couple of years. The coolant change should include the sealant "pills" to insure there wouldn't be any seepage into the oil pan.

Your car has a timing chain not a timing belt. The chain should last the life of the vehicle and is not a maintenance item.

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