I can only add one thing to suginami's accurate response and that is that the best timing chain maintenance is frequent oil changes, preferably hot and preferably draining overnight.

The worst enemy for your timing chain is microscopic particulate matter that accumulates in the oil. If you pull the drain plug right after shutting down the engine with oil temperature at its maximum, this particulate will be mostly suspended in the oil. Therefore, you will drain most all of it out. By draining overnight, you get out those last few drops of sludge. Those drops contain the highest concentration of this nasty particulate.

Merry Christmas,

Change oil hot, and change oil often,