Tinker,

At this stage I am only replacing the tensioner. The original is still installed and I know the design has been upgraded twice. Even though the car has approx. 157K miles, I have a degree or less of chain stretch. I have a slight amount of chain rattle at startup, only on a hot motor. If replacing the tensioner solves this, it's my plan to stop there. Hopefully, I will be able to visually check the tensioner rail when the pressure is off of it. If it's grooved, that will be a signal to remove the timing cover and replace the chain and all rails. If it's smooth, I'll stay with my original plan of tensioner only. I have exclusively used Mobil 1 and a 7000-7500 change interval. Any advice?

Jim