Longer filter is not needed, it's just for additional filtration surface.
And I think there's a member that mounted the oil cooler upside down in order to drain oil out, but again not required. I remembered somebody here says that even the vigorous GTR maintenance doesn't call for draining oil from oil cooler.
If dirty oil is a concern, just change oil more often, plus magnetic drain plug and filter mag.
Kn top of that, do oil analysis if you are really concerned about it.
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