How far have some of you gone.

[Checkswrecks]

As others wrote, I wouldn't worry a bit.
fwiw - I try to change oil and drive fluid every 5,000 just because it's easy to see on the odometer.

I've been in Alaska when the Haul Road had not seen rain for long enough to get horribly dusty (unusual) so will add that the ONLY caveat is if you eat a lot of dust day after day. Then I'd at least tap out or change the air filter and change the oil near the recommended intervals.

 

[POG]

This goes without saying, but enough older oil is better than no oil. It'll still be slippery. I would not worry about it and just verify/maintain the right level.

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