Rodrigolara: I've read your post carefully, but I'm still not sure I understand what you were told.
If the service writers told you to leave the FF unchanged until the MM indicated an oil change was due, that's certainly Honda's "official" advice. It's also stated in your owner's manual, and if you log onto Honda Owner Link (
www.ahm-ownerlink.com) you'll find this explanation and advice:
"
Your Honda engine was delivered with an oil that is specially formulated for new engines that have not yet developed their "natural" wear patterns and may contain minute particles from the manufacturing process.
American Honda strongly recommends this special oil be left in the engine long enough for these wear patterns to develop, usually until the first maintenance interval specified in your Owner's Manual, based on your specific driving conditions."
Turning to the issue of semi-synthetics, synthetics and "Genuine Honda Motor Oil," this gets a tad more involved.
Honda now sells two API SN 0W-20 weight motor oil products. Both are supplied and bottled for Honda by ConocoPhillips (one word)(NYSE symbol "COP"). One, part # 08798-9036 is a semi-synthetic -- i.e., a "blended oil" in other words. The other, part # 08798-9037, is a full synthetic. They are essentially the same as the two products that COP bottles for Ford under the Motorcraft label.
(To make this a bit more confusing, until recently Honda sold a third 0W-20 weight full synthetic bottled motor oil supplied by Idemitsu. (Silver bottle, green label.) That one, and only that one, had approximately 800 ppm of molybdenium, and Honda distributed it initially for use in its Insight hybrid. It can, of course, be used in any automobile that specifies a 0W-20 weight oil. Connoisseurs of motor oil loved it for its whopping dose of molybdenium which, arguably, is important (if not crucial) for proper lubrication in an engine that is subject to frequent starts and stops (i.e., a hybrid, in other words) and/or frequent cold- and semi-cold starts (again, a hybrid). Whether it offers any special or unique long-term anti-wear benefits when used in a conventional motor has been, and remains, the subject of considerable debate. The stuff also was expensive in comparison to other 0W-20s.)
Which brings us to Mobil 1's Advanced Fuel Economy (AFE) oil. Comparing apples to apples -- i.e., comparing Honda's (COP) full synthetic to Mobil 1's 0W-20 -- the Mobil 1 product has a slightly greater viscosity range and its cSt at 100 degrees C is slightly higher. It also has a robust additive package. (Neither point is a matter of conjecture. You can compare oil analyses of the two products here, on bobsistheoilguy.com.) FWIW, I like the stuff.
As for which oil product is better, IMHO it doesn't matter which one you choose. All have been tested extensively (the M1 0W-20 weight oil for over a decade), and all produce virtually identical UOAs (used oil analyses).
Finally, in my experience accounts excessive oil consumption in
any four-cylinder Honda engine are, at most, anecdotal and far, far from the norm. But you can research this for yourself and draw your own conclusions.