I was very fortunate and bought a couple of essentially new 2002 Kodiak 400s a month ago. I have a service manual for the machines, and changed the final drive fluid accordingly. After putting 43km’s of moose hunting on one of them today I noticed gear oil coming out of the overflow (up at the air intake). If I had to guess, I’d say the total amount spilled was less than a couple of tablespoons…just enough to cover most of the airbox top. I absolutely didn’t overfill it, nor was the oil milky.

In my online searches on this topic I’ve seen people say that the dealership told them that sustained high speeds on gravel or asphalt could result in such a leak, and someone else mentioned reversing at high speeds could also cause it. I did both today.

Does that sound accurate? If the high speed is the likely culprit, is it just that the oil is boiling and overflowing?

Thank you for your replies!

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