BMW F 850 GS (K81) — OEM Fluid, Tire Pressure & Maintenance Specs
853cc Liquid-Cooled Parallel-Twin DOHC 8-Valve 270-deg · Source: BMW F 850 GS (K81) (2018–2023) Official Owner’s Manual Maintenance Specifications
According to the BMW F 850 GS (K81) (2018–2023) Official Owner’s Manual Maintenance Specifications, the 2018–2023 BMW F 850 GS (K81) (chassis K81/0B09) requires 2.8 L (2.96 US qt) of SAE 5W-40 (JASO MA2, API SL / BMW Advantec Ultimate 5W-40) engine oil for a drain-only change and 3 L (3.17 US qt) with filter service (11428562889 / HF160). Standard solo cold tire pressure is 220 kPa / 2.20 bar / 32 PSI front (90/90-21) and 250 kPa / 2.50 bar / 36 PSI rear (150/70 R17), paired with 2× NGK LMAR8J-9E / DCPR8E spark plug(s) and a YTX14-BS / YTZ14S battery.
Drain only: 2.8 L (2.96 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~360 km (224 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 5W-40 (Alt: SAE 15W-50 (구형 F800 Rotax)) · JASO MA2 · API SL / BMW Advantec Ultimate 5W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.8 L (2.96 US qt) • With filter/strainer: 3 L (3.17 US qt) • Complete dry overhaul: 3.5 L (3.70 US qt) |
| OEM Oil Filter Code & Type | 11428562889 / HF160 |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 38 N·m (28.0 lb-ft / 3.87 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 90/90-21 · Rear: 150/70 R17 (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 220 kPa / 2.20 bar / 32 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 240 kPa / 2.40 bar / 35 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | NGK LMAR8J-9E / DCPR8E × 2 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTX14-BS / YTZ14S (12V 12.0Ah MF AGM) |
| Final Drive Maintenance | 525 Heavy-Duty X-Ring Chain — Maintain 25–35 mm slack and lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 853 cc · 95 hp @ 8,250 rpm · 92 N·m (67.9 lb-ft) @ 6,250 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 860 mm (33.9 in) · 229 kg (505 lbs) |
| Fuel Tank & Est. Real-World Range | 15 L (4.0 US gal) · ~24 km/L → ~360 km (224 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 10,000 km / 10,000 km • Air Filter / Spark Plug: 20,000 km / 20,000 km • Valve Clearance Check: 20,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Completely redesigned in 2018 (K81), moving from the 360-degree Rotax K72 with under-seat fuel tank to a 270-degree 853cc twin, steel bridge frame, and conventional front tank.
Oil & Clutch Mechanical Engineering Note
Unlike the earlier K72 F 800 GS that took 15W-50, the K81 853cc semi-dry-sump engine strictly specifies SAE 5W-40 JASO MA2 (3.0 L with filter HF160).
Garage Wrenching Gotchas
- Checking oil cold or after brief idling reads artificially low due to internal sump baffling; run until the radiator fan cycles before dipping.
- Final drive moved from the right side (K72) to the standard left side on K81; maintain 35–45 mm slack on the 525 X-ring chain unloaded on the sidestand.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the BMW F 850 GS (K81) (2018–2023) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 5W-40 (JASO MA2) at 2.8 L (2.96 US qt) drain-only and 3 L (3.17 US qt) with filter (11428562889 / HF160).
How do you accurately check the oil level on the F 850 GS (K81), and what are its service intervals?
Hold the bike upright on level ground 2–3 minutes after shutdown, wipe the dipstick, and rest it on the filler threads without screwing it in (threading it in reads artificially high and risks oil starvation). Torque the drain plug to 38 N·m with a new crush washer. Factory oil change intervals are every 10,000 km, with valve clearance inspection every 20,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the F 850 GS (K81)?
Fitted with 90/90-21 front and 150/70 R17 rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 32 / 36 PSI (220/250 kPa) solo or 35 / 42 PSI loaded. Seat height is 860 mm (33.9 in) at 229 kg wet weight, delivering ~360 km per 15 L tank.