Hmmm,
You’re going to get lots of opinions with this question but very little real data.
I seem to be one of the few that run long OCIs and post my test data.
I run 8,000 miles in my ST1100 (mfg recommended OCI) and have used mostly HDEOs as well as Maxlife, Honda GN4, GC, etc.
They all performed well for me and I was happy with the test results.
The bike has just less than 145,000 miles on it now and runs great with no oil consumption and good compression. Most of the miles are freeway commuting, cruising between 4,000 and 4,300 RPMs with occasional Redline (8,000 RPM) bursts
I can’t tell any difference in shift feel between new and old oil and see no measurable difference in gas mileage.
By the way, I recently posted my test results with the Redline 15W50 that’s in the bike now with 8,000 miles on it. I left the Redline in the bike and will re-test the oil at 12,000.
Rick