Going to look at a 85 300D turbo diesel tomarrow. 135k, new tires, front steering components, glow plugs, starter, and rear brake pads. $1500. Interior is is good shape and everything works as it should.(or so ive been told) guys a mechanic with mercedes expierence. He says the only rust on the car is some surface rust where the rear bumper meets the body. Is this common? Thanks, I'm shure I will have more questions tomarrow.