Do a search on my posts, rust shouldn't be an issue for a Texas car. However check the service records and oil change history!!! If the fluids have been changed and their is no blow-by your in good shape. MB coolent should also be in their as well as German filters. 603's don't like to be overheated make sure the cooling system is in good shape, ask if the head/head gasket has ever been replaced? Look on the head right above the 2nd injector back you will see a cast in number. If you see a "14" in the number it is an original head, not a bad thing but a good thing to know. The SDL is no rocket but should move right along. The engine should sound smooth, however a little rumble/skipping on startup is common a lot of 603's do it, a little lifter tick is normal also. Brakes should be smooth and bite hard, these cars have awsome brakes. Their should be no clunks etc when going over bumps. If this is your first German car it will ride more harder than US luxury cars, but they handle better and fly on the highway. SDL's are awsome good luck!
