Never. This is not an item you replace at a scheduled time or mileage. It should last the life of the engine.
A loose timing chain should be replaced.
It has a chain
Timing chain usually needs to be replaced each 180-200K miles.
Should be a belt not chain
at what milage should the timing chain be replaced on a 95 ford aerostar
unless there is noise coming from the timing chain, you should never need to replace it.
never needs to be replaced
This truck has a timing chain, not a belt. The chain will last longer than a belt and should not be replaced until it fails.
It has a timing chain which will last the life of the engine.
nissan micra has timing chain or cam chain and should be replaced at 200.000k
You are correct that the SL2 uses a timing chain. However, since it uses a timing chain it does not need to be replaced as does the timing BELT. In general, a timing chain should last the life of the engine.
It doesn't have a timing belt. It has a timing chain and it will last the life of the engine.