Salting the roads only eight times per winter would be a mild winter in SE MN.
Salt gets onto cars in the winter, but most of the rusting happens when the weather warms up. Heat and moisture speeds up the chemical reaction metal rusting.
Rinsing the underside of vehicles every Spring with clean water goes a long way to delay rusting on vehicles driven on salted roads. Wait until after Spring rains have rinsed all the salt of the roads then rinse off the underside of the chassis. The water in commercial car washes is recycled, by the month of May much of the salt is out of the recycled rinse water.
Salt gets onto cars in the winter, but most of the rusting happens when the weather warms up. Heat and moisture speeds up the chemical reaction metal rusting.
Rinsing the underside of vehicles every Spring with clean water goes a long way to delay rusting on vehicles driven on salted roads. Wait until after Spring rains have rinsed all the salt of the roads then rinse off the underside of the chassis. The water in commercial car washes is recycled, by the month of May much of the salt is out of the recycled rinse water.