ya i could have told you that strait up, on the 24v when you take off the oil filler cap you can see the timing chain idk about the 12v but it would be the same since all they did was add some valves, lol i know its a lil more than just poof and you got more valves but you know what im talking about

 

You have a timing belt, but that is not the maint. issue. it's the chain tensioners that need replacement and inspection. i know this is true for the 12v vr6 engine, i imagine the same is true for the 24v.