While there may more appropriate groups to anwer this question, I
trust the wisdom of this group ..... and it is metal related.

There seem to be a couple of theories regarding lubrication of a
motorcycle chain, in this case, a dirt bike. My concern with a "well
oiled" chain is that the dirt and grit sticks to the oil and acts as
grinding paste. A dry chain doesn't seem like a good idea either.
Any advice appreciated.

FWIW, it's my son's bike (250 4-Stroke) and
is used for trail riding, not competition. He wants to get the maximum
life out of the chain & sprockets.
Thanks.