My comment is that if these are comparably priced synthetics ..then way too many people are doing 3k OCI's to even assemble this much data.
When I first came to BITOG, I thought I was the only person left in the world that had a 3000 mile OCI.
After much reading and going back in the archives to January of 2004, I learned I was not alone.
From the searching and research that I have been able to do, on BITOG and other forums, the very large numbers of PM's I have received, I have learned that there are a great deal of folk that still have 3000 OCI. 5000 seems to be the most popular but 3000 is alive and well.
The local Walmarts that have service bays, the local quick lube places, the local mom and pop lube, tires, and AC places, still promote, recommend, push 3000 OCI and most folk do this.
I think that most "change my own oil" folk look at the prices at the various oil change places. You can buy a 5 quart jug of Mobil 1, Valvoline Synpower, or Pennzoil Platinum, along with a Wix or Purolator filter for less than the price of an oil change with conventional oil and a Fram filter at one of the lube places. You can get a 5 quart jug of Mobil 5000, Valvoline Premium, or Pennzoil conventional, and a Wix or Purolator filter for ABOUT half the price of a lube place conventional OCI, so they change more frequently. One of the chain auto parts places recently had a special for 5 quarts of Castrol and a filter for $9.99! For $30.00, you get 3 oil changes. That is about the price for one change at Walmart or some of the lube businesses.
I can buy 5 quarts of Amsoil, pay shipping, get a Wix filter locally, for about the same price for a change with one of the HM oils at Walmart. Our local Walmart charges $55.00 for a change with bulk synthetic and $58.00 for any off the shelf synthetic, and your choice of a Fram, AC, or Super-tech filter.
I think, my opinion only, 5000 is, or is becoming, the norm and 3000 will be around until there is some sort of regulation.