Oil Change Guide: 2025 Triumph Bonneville T100
Oil Change Guide: 2025 Triumph Bonneville T100
The 2025 Triumph Bonneville T100 is the entry-level model in the iconic Bonneville lineup. Powered by a 900cc liquid-cooled parallel twin with SOHC 8-valve heads, the T100 shares its basic engine architecture with the larger T120 but is tuned for a gentler power delivery, making it an excellent choice for newer riders and those who prefer a more relaxed riding experience.
The High Torque 900 engine features modern fuel injection, electronic engine management, and a wet sump oiling system. Like the T120, it uses a wet multi-plate clutch that shares oil with the engine internals, making oil choice critical for proper clutch engagement.
Triumph's recommended service interval for the Bonneville T100 is 10,000 miles, but many riders and independent shops prefer the 5,000-6,000 mile or annual interval for optimal long-term engine health and cleanliness.
Quick Reference Table
| Specification | Value |
|---|---|
| Engine Type | 900cc liquid-cooled parallel twin, SOHC 8V High Torque |
| Oil Type | Fully synthetic or semi-synthetic, API SJ+, JASO MA2 |
| Oil Viscosity | 10W-40 (preferred) or 10W-50 (hot climates) |
| Oil Capacity (with filter) | ~3.0 L (3.2 qt) |
| Oil Capacity (drain only) | ~2.7 L (2.9 qt) |
| Oil System | Wet sump |
| OEM Filter Part Number | T1218001 / T1218002 |
| Aftermarket Filter (HiFloFiltro) | HF204 |
| Aftermarket Filter (K&N) | KN-204 |
| Aftermarket Filter (Bosch) | P7209 |
| Aftermarket Filter (Mahle) | OC 1221 |
| Drain Plug Type | 17mm hex head bolt |
| Drain Plug Torque | 25 ± 2 Nm (18 ft-lbs) |
| Oil Fill Cap Location | Right side of crankcase |
| Sight Glass | Sight glass on right side of case |
| OEM Service Interval | 10,000 miles or 1 year (Triumph) |
Difficulty & Time Estimate
- Skill Level: Beginner — straightforward wet sump engine, very accessible
- Estimated Time: 25-40 minutes (first time), 15-25 minutes (experienced)
- Best Conditions: Warm engine, level ground, center stand or paddock stand, good lighting
Complete Tool List
| Tool | Size / Type | Purpose |
|---|---|---|
| Torque wrench | 10-50 Nm range | Drain plug torquing (critical) |
| Socket / wrench | 17mm | Engine oil drain plug |
| Oil filter wrench | Strap type or 76mm cup | Spin-on oil filter removal |
| Narrow-spout funnel | — | Clean oil fill through narrow opening |
| Oil drain pan | 4+ liter capacity | Collect used oil (up to 3.0L) |
| Nitrile gloves | Disposable | Protection from hot oil |
| Shop rags | — | Cleanup and wiping |
| New crush washer | 16mm x 22mm x 1.5mm aluminum (Triumph T6528002) | Drain plug reseal — replace every change |
| Socket wrench | 3/8" drive | Drain plug access |
| Flashlight | — | Sight glass inspection |
| Container for used oil | Sealed 4L jug | Transport for recycling |
Step-by-Step Instructions
Step 1: Warm Up the Engine
Start the T100 and let it idle for 3-5 minutes. The 900cc parallel twin reaches operating temperature quickly. Warm oil flows significantly faster than cold oil and carries more suspended contaminants with it. The ideal oil temperature is approximately 80°C (175°F).
Step 2: Position on Level Ground
Place the motorcycle on its center stand or a paddock stand. The T100 must be perfectly upright for accurate oil level checks through the sight glass. Do not use the side stand for oil level verification.
Step 3: Remove the Oil Fill Cap
Locate the oil fill cap on the right side of the crankcase. Remove and set it on a clean rag to allow air into the engine during draining.
Step 4: Position the Drain Pan
Place a 4+ liter drain pan beneath the engine. The drain plug is positioned on the bottom center of the crankcase, directing oil straight down.
Step 5: Remove the Drain Plug
Using a 17mm socket, loosen and remove the engine drain plug. Allow the oil to drain completely for 5-7 minutes.
Warning: Engine oil will be hot (150-200°F / 66-93°C). Wear gloves and avoid contact with the exhaust header pipes on the right side of the engine.
Step 6: Remove the Oil Filter
The spin-on oil filter is located on the lower front-right of the engine. Use a strap-type or 76mm cup oil filter wrench to loosen it by turning counterclockwise.
As the filter breaks free, oil will spill from the filter adapter. Have a rag ready.
Important: Inspect the old filter — confirm the rubber gasket came off attached to the filter and is not stuck to the engine mounting surface.
Step 7: Clean the Mounting Surface
Wipe the filter mounting surface clean with a shop rag. Check for any debris or old gasket material. A clean surface ensures a proper seal.
Step 8: Install the New Oil Filter
Apply a thin film of clean 10W-40 oil to the new filter's rubber gasket. Hand-thread the filter onto the adapter until it contacts the mounting flange, then tighten an additional 3/4 to 1 full turn.
Do NOT use tools to tighten spin-on filters — hand-tightening is sufficient and prevents gasket damage.
Step 9: Replace Drain Plug with New Washer
Clean the drain plug and inspect threads for damage. Replace the aluminum 16 x 22 x 1.5mm crush washer (Triumph T6528002) — always use a new washer for every oil change.
Reinstall the drain plug and torque to specification:
- Drain plug: 25 ± 2 Nm (18 ft-lbs)
Warning: Cast aluminum crankcase threads will strip if over-tightened. Use a torque wrench.
Step 10: Add Fresh Oil
Using a narrow-spout funnel, slowly pour 2.5 liters (2.6 qt) of fresh 10W-40 fully synthetic or semi-synthetic motorcycle oil meeting API SJ+ and JASO MA2.
Recommended oils: - Triumph Original 10W-40 (Mobil 1-manufactured) - Motul 7100 10W-40 (100% ester synthetic) - Castrol Power1 10W-40 - Shell Advance Ultra 10W-40
Critical warning: Do NOT use automotive oils labeled "Energy Conserving" or "Resource Conserving." These contain friction modifiers that will cause the T100's wet multi-plate clutch to slip. Always verify the JASO MA2 certification mark on the oil bottle.
Step 11: Circulate Oil and Check Pressure
Reinstall the oil fill cap. Start the engine and let it idle for 1-2 minutes. The oil pressure warning light should extinguish within seconds. Watch for oil leaks around the filter and drain plug.
Turn off the engine and wait 30-60 seconds.
Step 12: Final Oil Level Check
With the T100 upright on level ground, check the sight glass on the right side of the crankcase. The oil level should be between the upper and lower marks. Add oil in small increments (100ml) if needed.
Do NOT overfill. Too much oil causes foaming, increased crankcase pressure, and can lead to oil being pushed out through seals and breather tubes.
Step 13: Reset Service Reminder
The 2025 T100 features a digital instrument display with service reminders. Use the mode/info button on the left handlebar switch to navigate to the service menu and reset the oil service interval. Exact steps vary by firmware — consult your Owner's Manual.
If your T100 has an analog display, there may be no digital service reminder — track mileage manually.
Step 14: Test Ride
Take the T100 on a short 1-2 mile ride at moderate city speeds. After the ride, check for any oil leaks around the filter and drain plug. Re-check the oil level through the sight glass.
Tips, Warnings & Common Mistakes
| Mistake | Consequence | How to Avoid |
|---|---|---|
| Using "Resource Conserving" automotive oil | Friction modifiers cause wet clutch slippage and poor engagement | Verify JASO MA2 on the label every time |
| Reusing aluminum crush washer | Drain plug oil seepage | Replace washer every change (Triumph T6528002) |
| Over-tightening drain plug | Stripped threads in aluminum crankcase | Torque to 25 Nm with calibrated wrench |
| Double-gasketing the filter | Major oil leak | Confirm old gasket removed with old filter |
| Overfilling above upper sight glass mark | Oil foaming, crankcase pressure, seal leaks | Fill incrementally; check between marks |
| Checking oil level on side stand | Inaccurate reading — only valid when upright | Always use center stand or paddock stand |
| Not circulating oil before final check | Incomplete level reading | Idle engine 1-2 min, then check |
Oil Disposal
Used motor oil is environmental hazardous waste. Never pour it down drains, into soil, into storm sewers, or into household trash.
Where to recycle used oil and filters in the United States: - AutoZone — Free used oil and filter recycling at all locations - O'Reilly Auto Parts — Free recycling program - Advance Auto Parts — Accepts oil and filters free of charge - Walmart Auto Care Centers — Accepts used oil at most locations - Pep Boys — Free recycling - Local household hazardous waste facilities — Earth911.com for nearest center - Many Triumph dealerships — Accept DIY used oil (call ahead)
Used oil filters: drain 24 hours (pierce dome, sit filter-end down in a pan), wrap in sealed plastic bag, recycle.
Verification Notes
Verify the following specifications for your 2025 Triumph Bonneville T100 against your Owner's Manual:
| Specification | This Guide | Owner's Manual (Verify) |
|---|---|---|
| Oil Capacity (with filter) | 3.0 L (3.2 qt) | ______ |
| Drain Plug Torque | 25 ± 2 Nm (18 ft-lbs) | ______ |
| OEM Oil Filter P/N | T1218001 / T1218002 | ______ |
| Oil Viscosity | 10W-40 (10W-50 for hot climates) | ______ |
| Oil Standard | API SJ+, JASO MA2 | ______ |
| Crush Washer P/N | T6528002 (16 x 22 x 1.5mm Al) | ______ |
| OEM Service Interval | 10,000 mi or 1 year | ______ |
The T100 and T120 share many components including the oil filter and drain plug specifications. Always cross-reference with your vehicle's specific documentation. Owner's manuals available at Triumph dealers or triumph.com.