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Has anyone seen any credible tests of Valvoline Modern Engine oil on intake valve carbon build-up? I know Valvoline "advanced" full syn was already one of the lower volatility synthetics out there and, in theory, was one of the better choices for helping prevent carbon build up. Supposedly...

I know the "what's the best oil" question is often asked here. And I realize many have their personal favorites. But can anyone point me to some relatively recent measurements between the current crop of pure synthetics? Sadly, much of what I've found doesn't include many of the current oils...

I have firsthand reasonable proof, at least in one regard, even after only 1000 miles new oils of the same rating and grade don't perform the same. The vehicle is a 1987 Mazda B2200. ‘87 was the first year for the 2.2 liter version of that engine, and it has some well known valvetrain problems...