Yes, between 100-150k, you should have the stretch checked to be sure the timing chain is not too far out of spec. If it is way out, they should replace it. If it's not way out, at least you know you are ok. I remember your question of single vs double row coming up before but I do not know the answer as I have a diesel, and I knoq all diesels of my year had double row. I replaced mine at 134k and because it is 16 years old. I figured, $450 of insurance was worth it rather than having it break and replacing a $4500 engine.