I let the oil go in my previous vehicle (04 Chevy Colorado) until the oil life monitor said it needed to be changed. It didn't come on unntil I had over 14,000 miles on the oil. I sent a sample in and had it tested by Blackstone labs and they said it wasn't too bad. Definitely ready for change, but not harmfull to let it go that long. If the Colorado could go 14000 with the engine running for all of it, I'm sure the FEH can go 10K.

My 4WD
Wife's 4WD