I'm in the process of buying a 2000 Pontiac Montana. It has over 137,000 miles. However after test driving the van, I found it to be in very good condition. To the point , if you were to cover up the milage indicator, and tell me to guess. I would say it has 10,000 miles. Really, it feels and drives like a brand new one. Solid, know rattles, thumps, or dings. All the power is there and then some. It has the 3.4L, The inside is like new as well. My question is, should I worry about the 137,000 miles? Are they dependable with high milage?