BMW C 400 X (K09) — OEM Fluid, Tire Pressure & Maintenance Specs
350cc Liquid-Cooled Single SOHC 4-Valve (CVT) · Source: BMW C 400 X (K09) (2018–Present) Official Owner’s Manual Maintenance Specifications
According to the BMW C 400 X (K09) (2018–Present) Official Owner’s Manual Maintenance Specifications, the 2018–Present BMW C 400 X (K09) (chassis K09/0C09) requires 1.6 L (1.69 US qt) of SAE 5W-40 (JASO MA2, API SL / BMW Advantec Ultimate 5W-40) engine oil for a drain-only change and 1.8 L (1.90 US qt) with filter service (11427673541 / HF164). Standard solo cold tire pressure is 220 kPa / 2.20 bar / 32 PSI front (120/70 R15) and 250 kPa / 2.50 bar / 36 PSI rear (150/70 R14), paired with 1× NGK LMAR8D-J spark plug(s) and a YTX9-BS / BMW 9Ah AGM battery.
Drain only: 1.6 L (1.69 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~365 km (227 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 5W-40 · JASO MA2 · API SL / BMW Advantec Ultimate 5W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1.6 L (1.69 US qt) • With filter/strainer: 1.8 L (1.90 US qt) • Complete dry overhaul: 2 L (2.11 US qt) |
| OEM Oil Filter Code & Type | 11427673541 / HF164 |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 250 ml (0.25 L) — Hypoid Axle Oil SAE 75W-90 (250 ml rear gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70 R15 · Rear: 150/70 R14 (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: 270 kPa / 2.70 bar / 39 PSI |
| OEM Spark Plug & Quantity | NGK LMAR8D-J × 1 (Gap: 0.8 mm) |
| OEM Battery Code & Rating | YTX9-BS / BMW 9Ah AGM (12V 9.0Ah MF AGM) |
| Final Drive Maintenance | Dry Centrifugal V-Belt CVT — Inspect/replace V-belt and rollers every 15,000–20,000 km |
| 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 | 350 cc · 34 hp @ 7,500 rpm · 35 N·m (25.8 lb-ft) @ 5,750 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 775 mm (30.5 in) · 206 kg (454 lbs) |
| Fuel Tank & Est. Real-World Range | 12.8 L (3.4 US gal) · ~28.5 km/L → ~365 km (227 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
Launched in 2018 as the agile K09 urban scooter, gaining Euro 5 E-Gas throttle refinement in 2021 and upgraded electronics for 2025 with lighter bodywork than the C 400 GT.
Oil & Clutch Mechanical Engineering Note
Uses a dry centrifugal CVT isolated from the crankcase, yet mandates BMW Advantec Ultimate 5W-40 (1.8 L with HF164 spin-on filter) plus 250 ml of SAE 75W-90 rear hub gear oil.
Garage Wrenching Gotchas
- Clean the lower crankcase mesh strainer alongside the spin-on filter, and rest the dipstick on the threads without screwing it in when checking oil level.
- Because of the expanding Flexcase under-seat storage bay, the 12V YTX9-BS battery is located behind the upper front fairing panel near the handlebars.
5. Frequently Asked Questions (FAQ)
What are the engine oil and rear hub gear oil capacities for the BMW C 400 X (K09) scooter?
With an isolated dry CVT belt case, the engine requires 1.6 L drain-only or 1.8 L (1.90 US qt) with filter/screen (11427673541 / HF164) of SAE 5W-40 (JASO MA2). Service the rear reduction hub separately (final drive 250 ml).
How do you accurately check the oil level on the C 400 X (K09), 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 25 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 C 400 X (K09)?
Fitted with 120/70 R15 front and 150/70 R14 rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 32 / 36 PSI (220/250 kPa) solo or 35 / 39 PSI loaded. Seat height is 775 mm (30.5 in) at 206 kg wet weight, delivering ~365 km per 12.8 L tank.