Thanks guys for the wealth of info. Saw the local dealership in Toronto yesterday, and they said it should be changed at 180000 Km which transaltes to approx. 112000 miles, but they said they recommend to do at rou
ghly 150000km which is at 94000 miles, which is what you guys are aware of.
Peva, your diagram is excellent, but for someone novice like myself, is there, you, or anyone else summerise the early warning signs. For example, the reason for me to bring this matter up, even though I have 135000 km on my trep, is, in the past 3 weeks (under cold -25C Toronto temperatures), I am hearing a faint grinding sound precisely between 1200 and 1500 RPMs only. The sound never comes at RPMs outside of the range. I am wondering if this has anything to do with the Timing Chain.
The car has been running fine, although the usage is limited with about 60% of highway driving. Just to help diagnose the problem, My steering wheel causes a faint grinding sound (when turning right, which is where the other sound appears to be concentrated also) in sub-zero temperatures (never in summer) that sounds very similar to the one described above. No leaks of oil nor coolant either.