Since you are not interested in BMW dealer's moneymaking machine
Since you are servicing it yourself, ignore the garbage preented as essential.
Most of it is aimed at lining the pockets of dealers.
Maybe I take it to extremis, but I have at home receipts the original owner had for the first 2 years servicing, and I could have bought a perfectly good motorcycle for the same money, ( 10,000 miles, 4 services, averaging £320 per service) not serviced it at all, or even checked the oil, ridden to till it seized, dumped it at the side of the road & bought another. It would still have been cheaper than a dealer service regime.
If I leave my Wife's Skoda Fabia diesel into a local country Skoda dealership for an intermediate service, I get a bill for under £100. Why should a bike cost 3 times as much?
Many on this site will talk of the enhanced trade in value of a BMW serviced bike, but if you subtract the service costs from the enhanced value, it does not make economic sense.
On to servicing itself, in extremis.
Last 4 years: Change the oil & filter just as I park the bike up for winter - not in Spring - that way all acids etc are flushed out of the engine before lay up.
(I Always use any really good fully synthetic oil bought in a car dealers)
In Spring, put the battery on charge night before I am going to ride it.
Next morning: Kick tyres. If boot bounces off firmly, ride the damn thing.
Clean wheels check tyre pressures & disk pads when tyres are being changed. (Usually twice a year)
That's it.
Wait till you see all the horror posts regarding the above.
I have the bike 4 years. It has been round Europe 4 times.
I have, never, in this time, checked, never mind changed the oil in either gearbox or final drive. I have never pulled rocker covers off to check tappets. If it does not need done in a car, I reckon it does not need done on a low tuned bike like this.
I have never checked or changed brake fluid. (Other than a cursory glance at the level indicator glass)
Changed the plugs when bike started to miss. It cured the problem. (27,000 miles)
Watch for all the posts saying how they would never wish to buy a second hand bike of mine. There never are any. I never trade in or sell. I ride the guts out of it into the ground. Usually extremely high mileage.
It uses no oil, and, if something breaks, I fix it, properly, myself. So far, the only significant fault has been a fuel pump controller.
If it should eventually drop a valve, I will get the head repaired in a couple of days, & buy a piston & valves off
motorworks. Dealer servicing, and valve clearance checks do not seem to reduce the likelyhood.
I bought a spare final drive 3 years ago because of the horror stories, but it has hung on my shed wall since. (£125 - ebay) - Cheaper than BMW extended insurance, expecially when the (required) dealer servicing is factored in.
When I travel, I always carry with me a fuel pump controller & an ignition EWS ring, just in case. The EWS shear bolts have already been changed for Stainless allen screws, to make an change easy at the side of the road if required. (the bike cannot be stolen anyway without a key because of the EWS, so I reckon the shear bolts are a nonsense.)
This whole missive may not inspire confidence in my servicing ability, but you asked, and that's all I do. I bought the damn thing to ride, not to polish or pay massive maintenance bills.
Myke