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Timing Chain on 1992 Toyota Previa

I have a 1992 Previa (which I bought new!) and am not sure if I should be concerned about the timing chain. I have regular oil changes but don't know if I should have it maintained somehow? It has 249,000 miles.

Asked by for the 1992 Toyota Previa
Frequent oil changes will certainly add to the life of the chain. The valves are shim adjusted and need periodic check/adjustment. With the valve cover off the timing chain and guides can be inspected but they are not troublesome or a failure item.
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We have (had) a 1996 Previa LE Supercharged AWD. The timing chain slipped and broke after 285,000 miles. We drove it gently from 166,000 miles using synthetic oil - I am a mechanic and performed my own repairs. We owned it from 2005 and only needed about $1000 in parts (inc. tires) during our ownership (purchased for $4,000).