i have the 2016gsa with 1000 miles now, i guess i will follow your path, oil change twice a year, gear oil once a year. valve check TBD
i will have to research it some more.
what kind of tires are you running, OE or replaced it?
sorry to highjack the thread!
here is my version of the truth of the bike,
i love it, its awesome, i do not have any issues with the seat as others mentioned, it's a bit high for me, but i tried lower seats and it was not comfortable
I still have OEM tires. They look really good when the time comes I would get new set of OEM Anakee3's. I like those tires, they are good for my riding need. For your seat try to find Sargent low seat. I have the Sargent standard seat, I love it. I am 5"10 31" inseam bike is little tall but I have it set for soft and single without bags. It helps lot.
My riding buddy has 2015GSA white one with 18K, to this day his bike runs like new without any issues. He had valve check 12K service everything was perfect. GSA is his only transportation
he does NOT have car, he rides his GSA year around. Few weeks ago we had 21" of snow. Day after he showed up at my house to see if I want go for ride.