Quote:
Originally posted by HummerJim:
As long as you stay out of deep water, changing axel fluids more often than every 40K is a waste of money IMHO. I think dealers are sometimes overzealous for this business, the small, drive-in oil change shops are even worse.
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Overzealous
That's being nice. Dealers will try and sell someone any service even if not required.
I would say even if wheeling in deep water, and there are no leaks into the case, and you stay well below the vent hose, why would it become contaminated. If you have a slight leak out, then yes you could have a slight leak in; but there is some small pressure inside the case built up from the movement.
If someone feels safer doing this, then go ahead, it certainly can't hurt.
When living in TN, I primarily off-roaded in mud and water, and had no water intrusion into either axle. However, I constantly checked to make sure it was filled, and there were no small leaks.