Your Selected Vehicle

${ vehicle.year } ${ } ${ } ${ } Change Vehicle Remove

Shop Your VehicleGet an Exact Fit for your Vehicle

Shop Your VehicleGet an Exact Fit for your Vehicle

Shop Your Vehicle

Extended Protection Full Synthetic Motor Oil

Valvoline Full Synthetic Marine 4-Stroke Motor Oil SAE 10W-30


Buy more. Save more. Select Size / Qty

You get our best price when you subscribe
2 or 35% off 4 +10% off

Your ${ vehicle.year } ${ } ${ } requires ${ vehicle.capacity } quarts. We have pre-selected the quantities below for your convenience.

1 GA
1 QT
Add To Cart Add Subscription
No available purchase options for this selection.

A minimum 5 quart purchase is required on this product


50% stronger wear protection to meet the extreme heat and higher RPM demands of 4-stroke marine engines


Up to 8X better rust defense. Running or stored, your marine engine takes in moisture. Left unprotected this exposure can lead to severe rust damage


Engineered specifically for the unique demands of marine motors


Premium full synthetic formula for performance and durability in extreme conditions


Inboard Outboard Whatever floats your boat, Valvoline Full Synthetic 4-Stroke Marine Motor Oil is proven to maximize engine life. Unlike automobile engines, four-stroke marine motors face unique challenges from higher running speeds, seasonal use, and extreme operating environments that can lead to corrosion, excessive wear, and dirt deposits. Valvoline Full Synthetic 4-Stroke Marine Oil is optimized for performance and durability, providing 50% stronger wear protection and 8X better defense against rust than industry standards. All without compromising acceleration and horsepower. For peak performance, make sure your motor has the superior protection it demands. Full Synthetic 4-Stroke Marine Motor Oil from Valvoline – the trusted motor oil brand for more than 150 years.
Download Product Information Sheet Download Safety Data Sheet See All Buying Options
Find the right products for your vehicle


"Great for Engines. My boat had a light knocking sound that has been eliminated using Valvoline 4 Stroke Marine Full Synthetic Motor Oil. I was amazed after changing my current oil and replacing it with Valvoline. This has made me rethink the brand of oil I use in my vehicle."

~ khaki7yrs


Open FAQ Is it ok to switch motor oil weights?

Is it ok to switch motor oil weights?

It depends. Some vehicle manufacturers provide a range of recommended motor oil viscosity grades based on the outside temperature in which the car is driven. Other manufacturers recommend the use of only one motor oil viscosity grade. For best engine performance, always follow the manufacturer's recommendations found in your vehicle’s owner’s manual.

Open FAQ What does the

What does the "w" in a grade of motor oil stand for?

The "w" in motor oil stands for winter. The first number in the oil classification refers to a cold weather viscosity. The lower this number is, the less viscous your oil will be at low temperatures. For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil. The higher number, following the “w” refers to hot weather viscosity, or how fluid your oil is at hot temperatures. The higher the number, the thicker the oil at a specified temperature.

Open FAQ Why do some motor oils carry the

Why do some motor oils carry the "API Certified - For Gasoline Engines" starburst symbol on the bottle while others do not?

The starburst symbol means that the oil meets the requirements of the International Lubricants Specification Advisory Committee (ILSAC) in addition to the requirements of API, as stated in the API starburst symbol on the back of the bottle. Only certain viscosity grades are eligible for the starburst symbol.

Open FAQ How many miles can you go before changing oil?

How many miles can you go before changing oil?

Some motor oil brands claim 20,000-mile oil change intervals. But it comes down to individual driving habits, conditions, and ultimately what’s recommended in your vehicle owner manual. Valvoline recommends referring to your owner’s manual for oil change intervals.

Open FAQ Which Valvoline motor oils meet GM standard dexos 1™ Gen 3 standard

Which Valvoline motor oils meet GM standard dexos 1™ Gen 3 standard

The following Valvoline motor oils meet or exceed the requirements of GM standard dexos 1™ Gen 3: • Extended Protection Full Synthetic • Advanced Full Synthetic • Valvoline Full Synthetic

Video Gallery

DIY Bundles Delivered.

Each bundle is built with specific products, parts and tools to match your DIY project. So you get everything you needand nothing you don’t.

Shop Bundles
DIY Bundles Delivered.

Your Shopping Cart

You're ${ formatMoney(freeShipping()) } away from FREE shipping!

Your ${ vehicle.year } ${ } ${ } requires ${ vehicle.capacity } quarts.

Order summary

${ formatMoney(cart.total_price) } ${ formatMoney(cart.original_total_price) } ${ formatMoney(cart.total_price) }

Cart Error: You must purchase a 1 GA or 5 qt of ${ invalidProduct.title } in order to purchase single quarts. Click here to add it to your cart.

Continue Shopping

You Might Also Like