What is the price of a quart of pennzoil motor oil?
That all depends on what weight/grade of oil you need. 5W30, 10W30, 5W20, etc.
Only a Honda dealer sells it. Honda does not manufacture engine oil and it is nothing more than a brand name oil with Honda on the can. You are paying a premium price for the same oil you can buy anywhere. Wo makes their oil, I do not know. But any major brand of oil will provide the exact same protection and will not void the warranty. I use Pennzoil in my Honda.