Very glad to hear the oilite bushings are working well for ya! I think those are by far the best solution for the HRR and hope anyone reading this goes with that direction rather than the roller bearings I used initially.
Yep! That's exactly what I bought and it has the total redesign of the self propelled and depending on the year of you HRR a lot of upgrades to the deck and overall design. I think it cuts a lot better than the HRR I had too - mine never had a really "even" cut, but the HRN seems every bit as good as the HRX in my experience for cut quality. Now that I've used them both (late model HRX217HYA and new HRN216VKA) I'll say that the HRX feels heavier and a little more "premium" - the handles are thicker, the wheels have more grip if you're mowing across steep hills, slightly less vibration, the rear flap is made from better plastic, etc. With that said the HRN feels like a lightweight sports car. Super light feeling, easy to push / pull in every direction, and I can knock out my yard in record time as the self propelled can go really fast - faster than the hydro in the HRX. So far I love it, zero issues or complaints, and think it's the best "value" of the Honda mowers. Even though I don't have very tall or thick grass both the GCV200 and GCV170 seem a good bit more powerful than the GCV160 on the HRR which sometimes would bog a bit in certain areas of the yard.
Regarding oil - I broke in both my HRX and HRN with the supplied Honda 10w-30 and then changed it the first month to 10w-30 or 5w-30 synthetic. Then another "early" change a few months later before going to once a season oil changes. Currently I'm running Walmart SuperTech 5w-30 synthetic that I had left over from a car I sold. It seems to be perfect for both of them and meets Honda's 5w-30 or 10w-30 recommendation for all temperatures. Oil still looks like new when changing it. I think the biggest thing is getting a few oil changes in early on the engine's life and switching to synthetic immediately. I did the same thing with our golf cart and it's the same story with it - barely changes color of the oil between annual changes. I like the boutique oils and wouldn't question if they're better, but I do feel confident that virtually any synthetic changed regularly is "good enough" to keep these engines running far longer than I'll ever need them to - I expect 20+ years from both.