With all this rust chatter I had to put on the coveralls, grab a flashlight and take a look under the ol' beast and see for myself. It's been a couple of months or so since I had a look around.
It was pretty much as I had expected. Most of the fasteners, the torison bars keys, steering knuckles, and rear drivetrain housing has some rust. Some of the rusty areas will get much worse without attention, and some areas will always have no more than a surface rust. IMO, I believe most this rust we're seeing, is nothing more than cosmetic to the underside. Either way it definitely needs to be addressed by the dealer. Rust to the sheetmetal would be totally unacceptable, period.
I could stop or slow down the rusting fasteners and such, but would rather let someone else do it these days. I don't have any desire to start one of thoses rustproffing jobs like I went through a long time ago, and eventually lost. Not a GM product though, a MB 450SL.
I have a good dealer, will check with him tomorrow.
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