Totally Dissapointed!!!!!

True on the zinc bit, (incidentallyI run synthetic Rotella in my truck). Some ZDP based additives have shown up out there as a result. Everybody has their own pet snake oil, and I have used this stuff for years www.energyrelease.com

I would be curious what your engine builders logic behind a vented, non PCV setup? As well as his 20w 50 logic.

Without knowing static compression ratio and therefore cranking cylinder pressure, a compression test won't tell you a lot aside from indicating a mechanical defect in a single cylinder