Possible harm from running too much oil in crankcase?

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Jun 16, 2011
Northern Michigan
Didn’t know where to post this question on the WWW but have always trusted the credibility of the Mud Forums.
I recently purchased a 2012 Rav4 3.5 V6 with 20,000 miles on it from a large Toyota dealer 250 miles from home. After running a few tanks of fuel through - it seemed to run rough. I checked the oil and it was way over the full mark, upon changing the oil poured out over ten quarts (6.4 is spec).

My question is what type of long term harm could come from the overfilled crankcase?
well what comes to mind to me is foaming of the oil, a lot of oil will cause to much "splashing" from the crank, causing foam which will cause the pump to loose is prime, can't pump foam, which will cause starvation, etc.

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