Beware of automatic oilers off road.
Beware of sticky chain lubes off road.
Mate and I did 18000 km in Oz last year including heaps of deep dust and deep sand.
As we left Cooktown we fitted 13 tooth sprockets, a new one for me and a used one for my mate. I was running a Scott oiler, he was using an aerosol chain WAX (dries non-sticky).
I had the oiler set to dispense its whole contents every day. I figured that putting all that oil on the chain would flush the crap away.
Just short of Darwin, we fitted the 15 tooth sprockets again as we were in for a long haul on the seal. At that point we had done about 6000 km.
My 13 t sprocket was Fucked. It was close to turning inside the chain. My mates sprocket which started this leg second hand was pretty much untouched.
I can only conclude that the theories are right, that sticky chain lube + dust and dirt = grinding paste
Note that I said off road. I also have a Scott oiler on the Trumpy. The first chain and sprockets there, did 65,000km
I may not be as good as I once was, but I'm as good once as I always was.
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