VRP: what tests/evidence would convince you one way or another?

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I change the oil on my K20 that I purchased new every 3-4k miles with break in changes happening at 500 and 1500 followed by 3-4k. It started it's life on Molygen but then I had a jug leak before shipping back to FCP, so I swapped to pennzoil ultra or castrol edge gold, pending what is on rollback or my mood. At such a low mileage interval the oil isn't really "dark".

Now we all know oil color means absolutely nothing, however I am going to run R&P my next interval and see if it ends up being dark enough to show me anecdotal evidence of cleaning. I would be willing to bet just about anything the car doesn't have any carbon buildup, but maybe R&P does do what it claims and will make the engine spotless.

Just know R&P is the cleanest running oil I have every ran in my Hyundai, first time my dipstick color was brown and not black before a my 3,000 mile dump interval. My motor is very clean, i am just running it to make sure my ring lands a squeaky clean. Hyundai jamb ring very easily. I won't run R&P during the summer as I run 5w-40 and it gets plenty of thrash time.