"and a mitsubishi. all the ones that we just listened to and didnt drive had a lot of blowby. the sales man (one of them) said "they all do that" i said "no they dont" and poped the hood on my 350sdl and said "feel that, and this car has 149k miles on it". he said "oh.... my car has a lot too, guess i will have to start checking for it" i explained how the blow by comes from leaking rings. i guess a lot of folks just dont change the oil enough."

I'm a little bored this morning, so I thought I would challenge this stuff about blow by.

So how exactly does a person "feel blowby"? Since blowby goes past the rings and into the crankcase from which it is sucked out by the emissions system, what exactly are you observing when you make this diagnosis?
I can imagine what the salesman was really thinking about the know it all customer he was dealing with. However, most car salesmen are dumber than rocks, so maybe he actually believed you.

Sounds to me like a very strange way of choosing a car.

Sorry , but I just couldn't read what you wrote and let it go by as fact.

Steve