Exceeds NMMA “FC-W” Catalyst Compatible (Four-Cycle-Water) Specification Requirements. Wet-clutch compatible for superchargers. 

Package sizes include:
1- US Quart Bottle
1- US Quart Bottles (case of 12)
55- US Gallon Drum


AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil is an elite formula for gas-powered outboard or inboard four-cycle engines as well as personal watercraft that require a 10W-30, 5W-30 or SAE 30.

Features and Benefits of AMSOIL 4-Stroke Marine Synthetic 10W-30 Motor Oil

  • Designed for maximum anti-wear protection
  • Withstands extended periods of extreme heat and heavy load
  • Lowers friction
  • Fights deposit formation
  • Contains additives to prevent internal engine rust
  • Resists oil usage
  • Capable of longer service intervals in some applications
  • Warranty approved carrying the NMMA “FC-W Catalyst Compatible”  specification

Serious Wear Control for 4-Stroke Inboard, Outboard or PWC Engines

Whether you operate at high RPM or troll all afternoon, AMSOIL 10W-30 Marine Motor Oil is built around a 100% synthetic base oil and loaded with anti-wear additives. AMSOIL 10W-30 will not thin out or shear down under high heat. It lowers friction to minimize heat generation and maximize efficiency. This 4-stroke marine 10w-30 oil can help keep your engine running its best for many seasons to come.

Maintains Your Engine WarrantyNMMA FC-W Catalyst Compatible Logo

AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil surpasses the NMMA (National Marine Manufacturers Association) “FC-W” specification, so your warranty is safe and secure. AMSOIL Marine 10W-30’s NMMA Registration number is FC-00358P.

Serious Anti-Rust/Corrosion Protection

Regular car oil and lesser 4-stroke power sport oils do not contain rust and corrosion additives which are vital to marine engines. AMSOIL 10W-30 Marine Oil is packed with anti-rust additives to protect your engine during the season and during long off-season storage periods.

Resists Oil Consumption

AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil fights oil usage in hot operating temperatures due to its low volatility and shear stable formulation.

Suitable Applications for AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil (gasoline engines only)

Four-stroke outboard engines 

  • Honda (can replace 5W-30)
  • Mercury
  • Yamaha
  • Johnson/Evinrude
  • Bombardier/BRP/Rotax
  • Suzuki
  • Nissan
  • Tohatsu

Four-stroke inboard and inboard/outboard (stern drive) engines 

  • Mercruiser
  • Volvo Penta
  • OMC
  • Chevrolet
  • Chrysler Marine
  • Crusader
  • Marine Power
  • Ford

Four-stroke personal watercraft engines

  • Polaris
  • Sea-Doo (BRP)
  • Yamaha
  • Honda

AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil is suitable for applications requiring the following specifications:

  • NMMA FC-W Catalyst Compatible
  • API SM
  • JASO MA

AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil can replace the following viscosities in gasoline-powered engines:

  • 5W-30
  • 10W-30
  • SAE 30

Service Life of AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil

Four-Stroke Outboard Motors and Personal Watercraft
Change oil at intervals as suggested by your owner’s manual. Change oil filter at every oil change.

Inboard, Inboard/Outboard (I/O), Stern drive engines
Change oil at twice the interval as suggested by your owners manual or annually (whichever comes first)

Mixing AMSOIL Synthetic Marine Oil with Other Brands

AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil is compatible with all other brands of conventional, semi-synthetic and synthetic engine oils. While you can safely mix AMSOIL Synthetic Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL oil.

The use of any aftermarket oil additives is definitely not recommended.

Specifications

 AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCT)
SAE 10W-30

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)11.8
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)75.6
Viscosity Index (ASTM D-2270)151
CCS Viscosity, cP @ (°C) (ASTM D2602)6032 (-25)
Flash Point °C (°F) (ASTM D 92)230 (446)
Fire Point °C (°F) (ASTM D 92)258 (496)
Pour Point °C (°F) (ASTM D 97)-39 (-38)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)7.8%
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm)0.41
Total Base Number (ASTM D-2896)7.9
HTHS (cP)3.5
Humidity Cabinet Rust (ASTM D-1748)Pass
AMSOIL 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil
A synthetic oil for 4-stroke boat motors such as outboard, inboard, inboard/outboard and four-cycle personal watercraft.
Brand: AMSOIL
Manufacturer: AMSOIL
Model: 10W-30 Formula 4-Stroke Marine Synthetic Motor Oil
Product ID: WCT