That is a great question. Seems like it might be a good idea to run it for a couple of minutes every so often. Similar to running a a/c in the winter, although that gets its use via the defroster in the winter.
I Had a 1973 CJ-5 & It Said, Drive Vehicle (5) Mi. Per Month in 4WD to Insure Proper Lubrication of All 4WD Parts. I Don't Know About "Newer" Vehicles These Days. I Would Definitely Say, (If) You Are Going to Do It on Dry Pavement, Use 4W-Hi Selection. Keep Speeds "Very" Smooth & At a "Very" Reasonable Speed. 35MPH Then Be Very "Careful" Taking Sharp Turns the 4WD Tries to Fight Itself. Go Low & Slow. But I Would Get a More Current Up-to-Date Answer.
Actually do not do not apply 4wd on a paved surface with good traction the transfer case driveshaft and CV shafts will wear out but if u do lose traction use 4wd. I would not touch it unless if I was stuck or going to be. Others might say it won't hurt but thats why they have to have all those clutches because people use it wrong old cars with 4x4 locked in when u turn on pavement they literally stop or break a driveshaft on these your going to have a clutch wear out.
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