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The Shadow 1100’s wet clutch shares oil with the engine and transmission, so the oil needs to meet the JASO MA standard for proper clutch friction — a car-spec “Energy Conserving” oil with friction modifiers will make the clutch slip.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Pro Honda GN4 10W-40 | $8-$12 (per quart) | Amazon · eBay |
| 2 | Castrol Actevo 10W-40 | $8-$12 (per quart) | Amazon · eBay |
| 3 | Shell Rotella T4 15W-40 | $20-$28 (per gallon) | Amazon · eBay |
| 4 | Mobil 1 Racing 4T 10W-40 | $10-$14 (per quart) | Amazon · eBay |
The picks, in detail
Pro Honda GN4 10W-40
Honda’s own JASO MA motorcycle oil, formulated specifically for shared engine/transmission/clutch systems like the Shadow’s.
- JASO MA rated
- 10W-40 viscosity
- Formulated for wet-clutch motorcycle engines
- Matched exactly to Honda’s own spec
- No guesswork on compatibility
- Pricier than generic automotive-branded oils
Castrol Actevo 10W-40
A motorcycle-specific Castrol line popular among Shadow riders as an alternative to OEM oil.
- JASO MA/MA2 rated
- 10W-40 viscosity
- Motorcycle-specific additive package
- Widely available
- Trusted brand with motorcycle-specific formulation
- Slightly pricier than car-branded oils not rated for wet clutches
Shell Rotella T4 15W-40
A heavy-duty diesel-rated oil with a JASO MA2 certification that’s a long-time favorite among air-cooled V-twin riders.
- JASO MA2 rated
- 15W-40 viscosity
- Robust additive package for older/high-mileage engines
- Excellent value for the quantity
- Strong reputation in air-cooled V-twin communities
- Heavier viscosity than 10W-40, check your climate/manual before choosing
Mobil 1 Racing 4T 10W-40
A full-synthetic motorcycle-specific oil for riders wanting maximum protection and consistent performance.
- JASO MA rated full synthetic
- 10W-40 viscosity
- Motorcycle-specific additive package
- Full-synthetic protection and consistency across temperature ranges
- Trusted, widely available brand
- Costs more per quart than conventional oils
Buying tips
- Always confirm JASO MA or MA2 rating — never use an “Energy Conserving” car oil, as its friction modifiers will make a wet clutch slip.
- Stick with one oil brand/weight consistently rather than switching every change — the Shadow community consistently recommends this.
- Change oil every 3,000-5,000 miles, or per your owner’s manual interval, especially if the bike sees a lot of stop-and-go riding.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.