AWD vs 4WD
Constant 4X4 are usually called AWD. It is electronically controlled. Some AWD can even sense the difference in tread depth!
I had a set of WR 3Gs on my MB with about 40% tread left. One tire suffered a road hazard. I had road hazard warrantee on all tires. The Nokian dealer strongly recommend replacing all 4 tires under the warrantee instead of one, otherwise the AWD mechanism will act up.
I replaced the WR 3Gs with WR 4Gs at no additional cost. Great tires!
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