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There is no guideline about how long to use 4wd. Use it as needed. If you can get around in 2wd, then do it, no matter what the conditions are. 4wd isn't magic, it just turns more tires. If you lose control in 4wd its less predictable then if you lose control in 2wd. If you're having traction issues in 2wd, then try 4hi. That is your best bet, but it shouldn't be an automatic for driving on ice or snow. The truck is very capable without 4wd. Tires are the limiting factor to your traction.
4LO doesn't add any additional ability to the truck than 4hi did, it just provides lower gearing. Your tires will turn faster with less throttle input, it does nothing to make the truck more capable. It isn't stronger or better. If you're not sure when to use 4LO, then don't. You don't need it.
2005 F-350 King Ranch CCSB 6.0L. 4x4
Functional-Rotella T-6 5w-40, Ford 135amp alternator and a new pair of Interstate Megatron Batteries275/70/18 BFG AT's.
Rockwood Roo 19 Hybrid travel trailer.
Rv comfort and sleeping under canvas!