Re: Question about timing chain
Timing chains can last a long time. Most are double roller design for better durability. As long as you change the oil regularly, the chain will outlast the pistons. A good thing to do every couple years is to run a carbon cleaner through the engine. There are two GOOD ones on the market that I have used myself. In some rare cases you'll even notice a gain in performance from freeing up built up carbon on valves, etc.
The first is called Auto-RX, available online for around $15. You add it to your engine oil and drive for about 800miles. Then replace the oil and filter. Its recommended to replace the filter first depending on engine condition as it might have more sludge build up in the engine and can clog a filter (never heard of this ever happening). The second is called SeaFoam, available at most auto parts stores. It comes in a can and there are various ways you can use it. The best is to take off a vacuum line from the brake booster and allow the vehicle to suck in about half a can (250mL or so). The engine will eventually stall out. Then wait 15-20minutes and crank the vehicle until it starts (generally under one minute). A lot of white smoke will come out of the exhaust for several minutes. The Seaform breaks down the carbon and blows it out. It shouldn't affect your cat converter or any other emission components. They recommend to add the remaining half can between your crankcase (add to oil) and the other half of that to the fuel tank. It's safer just to add the remaining half can to the fuel tank as some engines don't like anything messing around with their oil supply.
I recommend either treatment and then use a full synthetic oil and change it every 4-5K miles or 7500kms. This will extend the life of the engine and decrease component wear and future sludge buildup that can cause engine failure. You may change synthetic oil sooner, at the standard 3K interval but it's not necessary. Longer drain intervals will also come in handy when you go on your long road trips! Better piece of mind all around.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!