What's up fellas? I have an 01 yukon 4x4 that i bought from a family member last year. I have no 4x4 experience and I never really engage the 4HI on her. I was told by a friend a while back that I need to engage the 4HI every now and then to keep everything lubricated or something to that effect. I had a few at the time so can't remember the exact words. Can anyone confirm this? I just need to know if I go 10-15K miles on her without engaging the 4HI will I be doing any damage to any compenents in the long run? I have a few places close by where I can take her off road for some minimal use but not really into that personally. Any advice would be nice. Thanks.