Up here in NH we have the same issue.Lots of salt and sand spraying off the tires is like taking a grinder to the paint. i have seen some rigs that get oiled they are the ones still driving. Some guys use transmisson fluid mixed with paraffin and heated then applied, others use chainsaw bar and chain oil.
What i understand is used motor oil picks up additives from the gasoline being burned and that can accelerate deterioration of all the rubber lines and seals underneath.I don't know much about it myself just what guys have told me.
trans fluid is more rubber friendly as well as bar oil.
Go ahead and spray it I'm gonna this year, just make sure you check your brake and fuel lines often.
got Jeep got stuff, never enough of the right stuff tho
Am I in deep enough yet?