Oil is necessary, to keep the impeller lubed, but it shouldn't affect the rig (oil won't mix with water). The oil should stick to the insides of the housing, and the extra will end up in the water, so if you can, do the lube job with a bucket, THEN install your pump in your rig.
You don't need to worry about the brushes. You'll replace that pump long before they wear out (right?).
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