Are you sure you don't have a Toyota pickup?
I don't wanna be a wiener, but just out of curiosity, when all this was occurring, you had both feet off the pedals?
My truck has bumped the idle a couple times on me, but I attributed it to myself having 13EEE feet pushing both pedals down at the same time.
I fail to see the reason for engine teardown just because the engine oil is high. I've seen trucks with over 25qts in the pan, and teardown hasn't been necessary.
What is the oil high from? Fuel? Coolant?
Is there oil contamination in the charge air cooler?
Send me a PM (since you said you're new, Private Message, top right corner of your screen on here.) on here if you want, leave me a phone number and I can give you a buzz and we can run through this a little if you want to.
Hope this helps.