Eddie,

This protective film 3M makes works very well and unless you get real close, you can't even tell it is on. Wash and wax your SUV like normal.

Here is MN the winters are real hard on car bodys. The sand that the DOT puts on the roads in the winter turns to sand blasting come spring. I can only imagine that 4-5 years later, your resale value will increase if only because there are no rock chips on the paint.

The one caveat is that you want a professional to apply the product. It is not a do it yourself item. Take care of your ML320 and I'll want to buy it when you are through with it!

Bill