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I would doubt you need any oil in the box at all. You need to check the spec of the chain. It may well be "o ring" chain with seals to keep the EP90 out of the bearing area!
The chain is going far faster than it is designed to, but the chain load is, I bet, far lower than the designed maximum
Can you adjust the tension. check it isnt too tight.
But basically you have there a mechanical oil heater. Half fill that with oil and I bet it is consuming 4bhp at 6000 rpm
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