Mobil 1 15W-50 Synthetic
Since K bikes have a dry clutch, you do not need to use special motorcycle engine oil. Car oil is fine.
Shell Rotella Synthetic 5W-40
Castrol GTX 20W-50
When oil is changed
If there is a sticker on it then be sure to remove that prior to installation.
Transmission Gear Oil
Mobil 1 Syn Gear Lube LS 75W-140
Though BMW recommends 75W-90, 75W-140 tends to make K bike transmissions a bit less "clunky" when shifting.
Final Drive Gear Oil
Mobil 1 Syn Gear Lube LS 75W-90 (or 75W-140)
Moly Gear Oil Additive
Guard Dog GD-421 Moly Additive
When transmission or final drive gear oil is changed
Moly additive helps reduce friction and wear. It takes several hundred miles for it to "wear in" but in a K bike transmission you will notice smoother shifting using GD-421.
Transmission: 3.6 fl.oz. (106 CC)
Final Drive: 1.1 fl. oz. (32 CC)
NAPA Gold 3032
Remove the front hose clamp first and then you can do the rest outside of the tank.
BMW Part 13721460337
BMW recommends 24,000 miles but K air filters are very oversized so changing the air filter on a longer interval is OK.
Do not over-tighten drain screws when reinstalling. The threads strip easily if you're not careful.
Guard Dog GD-525 Moly Grease
For K75s & K100s, it's a good idea to lube the final drive splines every time you install a new rear tire.
(that is suitable for use with aluminum engine parts - most are these days)
Every two years
Pre-mixed 50/50 is OK but 60/40 water/coolant has better hear transfer. Be sure to use only distilled water in the cooling system.
At least every two years although annually is preferable
Use only DOT 4 brake fluid.
Rear for 4V K bikes
Minimum pad thickness:
Front for 4V K bikes
Disc Brake Quiet
When brake pads are replaced or your brakes start squealing
Helps reduce disc brake squeal.
3M Silicone Spray
For the chrome rods the windscreen bracket slides on. Silicone attracts less dust than other lubricants.
Heat Sink Compound
Radio Shack Silicone Base Heat Sink Compound
Goes behind the ignition amp on the lower front left corner of the battery tray. Clean the old stuff off first.