Best Synthetic Oil for Japanese & European Street, Sport, and Adventure Motorcycles
Modern metric motorcycles run hotter, rev higher, and ask more of their oil than any car engine. Engine and gearbox share a single sump with a wet clutch — meaning your oil has to lubricate, cool, and shift simultaneously without ever causing slip. AMSOIL Synthetic Metric Motorcycle Oil is JASO MA2 wet-clutch certified across all four viscosities (5W-40 MMF, 10W-30 MCT, 10W-40 MCF, 15W-50 MFF) and meets API SN — the standards required by virtually every Japanese and European OEM.
Four Viscosities — Pick the One Built for Your Bike
- 10W-40 (MCF) — the workhorse grade for Honda CB/CBR, Yamaha MT/R, Kawasaki Z/Ninja, Suzuki GSX, Ducati Monster, KTM Duke, BMW S 1000, Triumph Street Triple, and Aprilia RS.
- 10W-30 (MCT) — lighter viscosity for high-revving supersports and small-displacement metrics that specify 10W-30.
- 15W-50 (MFF) — heavier film strength for big metric cruisers, large ADV bikes, hot Florida summers, and aggressive sport-touring.
- 5W-40 (MMF) — cold-weather and OEM-specified grade for many KTM, Husqvarna, BMW, and Ducati models.
Premium Ea Motorcycle Oil Filters
Pair your AMSOIL oil with an EaOM (black) or EaOMc (chrome) premium oil filter — synthetic-media construction rated for AMSOIL extended drain intervals and direct-fit for most metric and V-Twin applications.
Shock Therapy® Suspension Fluid
Forks and shocks deserve the same engineered fluid as the engine. AMSOIL Shock Therapy is a 100% synthetic suspension fluid that resists foaming and shear breakdown for repeatable damping ride after ride. Choose #5 Light (STL) for plush feel and #10 Medium (STM) for firmer ADV or sport-touring damping.
Powersports Antifreeze, Octane Boost & Gasoline Stabilizer
Round out the service kit with AMSOIL Powersports Antifreeze & Coolant (PSAF) — non-toxic, all-metal-compatible propylene-glycol coolant for liquid-cooled metric and ADV bikes — plus Motorcycle Octane Boost (MOB) to maximize power on ethanol pump gas and Gasoline Stabilizer (AST) to keep stored fuel fresh up to 12 months.
AMSOIL vs. Motul, Castrol Power 1, Mobil 1 Racing 4T & Spectro
AMSOIL Synthetic Metric Motorcycle Oil is independently tested against Motul 7100, Castrol Power 1 Racing, Mobil 1 Racing 4T, Royal Purple Max-Cycle, and Spectro Platinum — and consistently demonstrates better wear protection, higher film strength, and lower volatility. Backed by the AMSOIL Limited Warranty and Magnuson-Moss federal warranty protection for your factory motorcycle warranty.
Motorcycle Oil for Florida, Tampa Bay & the United States
1stSynthetic.com is your independent AMSOIL Dealer based in Dade City, Florida, serving sportbike, ADV, and touring riders across Tampa, Lakeland, Wesley Chapel, Zephyrhills, Brooksville, Brandon, Sarasota, Orlando, and the entire United States. Order online and ship direct from the AMSOIL distribution center, or join the Preferred Customer program to save 25% on every motorcycle oil order, every time.