Skip to content
Amsoil Logo

National Synthetics

Independant Amsoil Dealer

Become An AMSOIL Commercial Account
Primary Menu
  • Login / Create Account
  • Vehicle Lookup
    • Auto & Light Truck
    • Motorcycles
    • ATV
    • UTV
    • Personal Watercraft (PWC)
    • Marine Outboard
    • Snowmobile
    • Heavy Duty
  • Shop Direct Now
  • Free Catalog
  • Amsoil Products
    • Signature Series
      • Motor Oil
    • Amsoil 2-stroke Powersports Lubricants
  • Blog
    • Amsoil Product Info
      • What are the benefits of using Amsoil Quickshot?
  • Contact us
Watch Videos
  • Home
  • Articles
  • What Marine Motor Oil is Right for Your Boat Engine?
  • Articles
  • Marine

What Marine Motor Oil is Right for Your Boat Engine?

Tisha Maguire March 28, 2023 4 min read

AMSOIL Synthetic Marine Motor Oil!

Although many boaters and anglers aren’t aware, here’s why dedicated marine motor oil is vital to boat engine protection.

Truck Pulling a boat that is using the correct Amsoil Marine Motor Oil to protect the weekend making sure the boat keeps running as it should
Truck Pulling a boat that is using the correct Amsoil Marine Motor Oil to protect the weekend making sure the boat keeps running

Rust and Corrosion

Protection against rust and corrosion is the primary reason to use Amsoil Synthetic Marine Motor Oil in your boat engine. Despite what most people might naturally assume, motor oils have no natural ability to protect against rust or corrosion. Instead, special rust and corrosion inhibitors must be added to the formulation to provide the required protection. Most oils simply don’t contain the correct additives in the correct concentration.

During engine operation, a layer of oil coats engine parts and the crankcase walls. The lubricant film protects against rust and corrosion as long as it remains in place. However, after you shut down the motor for the day, gravity draws the oil back down into the oil sump, leaving components unprotected.

The longer the engine sits, the more likely rust and corrosion will form. Since cars and trucks are typically driven daily, rust and corrosion largely isn’t a concern. As such, most automotive motor oils don’t contain sufficient rust and corrosion inhibitors for marine engines.

Once rust begins to form, it doesn’t stop. Rust can slowly spread to the crankshaft journals, cylinder wall, piston rings and other areas. Rust acts like sandpaper and scours metal surfaces until engine failure results. Rust can also prevent the piston rings from forming a good seal against the cylinder wall, which reduces compression and leads to power loss.

Chose Amsoil Synthetic Marine Motor Oil formulated with anti-rush and anti-corrosion additives because rust acts like sandpaper and scours until engine failure results.

Aluminum parts may not rust, but they can corrode, especially in marine motors constantly exposed to humid air. All cylinders aren’t completely sealed when the engine shuts down, allowing damp air to infiltrate the combustion chamber and cause aluminum pistons to corrode. Corrosion on the piston crown invites conditions that can lead to pre-ignition detonation, a phenomenon where the fuel/air mixture ignites sporadically and potentially causes catastrophic engine failure.

Marine motor oils are specifically formulated with anti-rust and anti-corrosion additives to protect your boat’s engine. These additives form a resilient protective layer that clings to engine parts for maximum protection. Make sure you choose a dedicated Amsoil Synthetic Marine Motor Oil to prevent rust.

Fuel Dilution

Fuel dilution is another problem many boat owners don’t think about. Fuel leaking into the oil sump is especially problematic in marine engines compared to other engines.

Outboard motors typically use lake or river water for cooling. When started, the engine draws water into the cooling system and circulates it throughout. Marine engines generally take longer to warm up than engines with a closed cooling system that uses a radiator and coolant.

A cold engine can prevent the rings from sealing completely. More clearance between the ring and cylinder wall allows fuel to leak into the oil sump, diluting the oil and reducing its ability to protect against wear. Be sure to choose a dedicated Amsoil Synthetic Marine Motor Oil to keep the cold engine lubricated and minimize fuel dilution.

Fishing boat having used Amsoil Marine Oil to ensure they maximize the marine engine performance and life so they can stay on the water longer

AMSOIL maximizes your marine engine’s performance and life, so you can stay on the water longer!

Choose AMSOIL Synthetic Marine Motor Oil to minimize fuel dilution.

Increased Stress

Adding to the challenge, marine motors are constantly under load, which physically damages the structure of conventional motor oil, reducing the oil’s ability to guard against mechanical wear.

Consider that a typical marine motor propelling a boat at 30 mph operates around 5,000 rpm. Compare that to an automotive engine, which runs about 2,000 rpm at 60 mph. Unlike automotive engines, which shift gears to reduce engine speed and rpm, boat motors only run in forward or reverse, putting more stress on the oil’s ability to both cool and lubricate the engine under load.

That increased stress requires a robust oil formulated to withstand the shearing conditions inside the engine. An improperly formulated oil loses viscosity, becoming thinner under stress and heat, which prevents the oil from forming a durable lubricating film that protects against wear on moving parts. Always choose a dedicated Amsoil Synthetic Marine Motor Oil designed for the increased engine stress found in marine environments.

Fishing boat that used AMSOIL Synthetic Marine Engine Oil formulated to deliver the extra measure of resistance to rust, corrosion and viscosity loss that marine engines need to operate longer at peak performance under harsh conditions
Amsoil Synthetic Marine Engine Oil

Amsoil Synthetic Marine Engine Oil is formulated to deliver the extra measure of resistance to rust, corrosion and viscosity loss that marine engines need to operate longer at peak performance under harsh conditions.

Use the Amsoil Marine Outboard Lookup Guide to find specific product recommendations for your marine engine model.


Address:
National Synthetics – Independent AMSOIL Dealer
110 Northcutt Station
Acworth GA 30101
Phone:
+1 (678) 799-9062
Email:
sales@nationalsynthetics.com

Continue Reading

Previous: Amsoil Synthetic Biodegradable Hydraulic Oil ISO 46
Next: Amsoil Gasoline Fuel Additives Work – The Data Proves It

Related Stories

Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Amsoil Order Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Order
2 min read
  • Articles
  • ExclusivePromos

Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Amsoil Order

December 6, 2023
The Role of Amsoil in Enhancing Racing Performance The Role of Amsoil in Enhancing Racing Performance
19 min read
  • Amsoil Racing and Sponsored Events
  • Articles

The Role of Amsoil in Enhancing Racing Performance

December 1, 2023
Amsoil Preferred Customer/Catalog Customer Promotion – Amsoil Cuffed Beanie $5 when they order $75 or more Amsoil Preferred Customer/Catalog Customer Promotion - Amsoil Cuffed Beanie $5 when they order $75 or more
2 min read
  • Articles
  • HistoricalPromos

Amsoil Preferred Customer/Catalog Customer Promotion – Amsoil Cuffed Beanie $5 when they order $75 or more

November 22, 2023

Recent Posts

  • Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Amsoil Order
  • The Role of Amsoil in Enhancing Racing Performance
  • Amsoil Signature Series: A Comprehensive Review
  • Amsoil Preferred Customer/Catalog Customer Promotion – Amsoil Cuffed Beanie $5 when they order $75 or more
  • Boosting Engine Health with Proper Filtration: A Look at Amsoil’s Synthetic Oil Filters

Archives

  • December 2023
  • November 2023
  • October 2023
  • September 2023
  • August 2023
  • July 2023
  • June 2023
  • April 2023
  • March 2023
  • February 2023

Categories

  • 2 Stroke
  • Amsoil Racing and Sponsored Events
  • Articles
  • ATV/UTV
  • Behind the Scenes at Amsoil
  • Biodegradable
  • Commercial
  • Diesel
  • Dirt Bike
  • DIY & Maintenance
  • Environment Friendly
  • Environmental Impact
  • European Motor Oil
  • ExclusivePromos
  • FAQs
  • Filtration
  • Fuel Additives
  • Fuel and Diesel Additives
  • Gasoline
  • Gear Oil
  • General Purpose Cleaners & Protectants
  • Grease
  • HistoricalPromos
  • History of Synthetic Motor Oil & Amsoil
  • Horsepower
  • Hybrid Motor Oil
  • Hydraulic Oil
  • Industry Innovations
  • Industry Trends & Insights
  • Lubricant Application in Different Industries
  • Marine
  • Motor Oil
  • Motorcycle
  • Oil Analysis
  • Performance Improver P.i.
  • Product Comparisons
  • Product Reviews
  • Race
  • Semi-Synthetic Bar and Chain Oil
  • Signature Series
  • Small Engine Oil
  • Synthetic Water Resistant Grease
  • Torque
  • Transmission Fluid
  • Understanding Synthetic Oils

You may have missed

Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Amsoil Order Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Order
2 min read
  • Articles
  • ExclusivePromos

Amsoil Promotion: Free Scott Birdsall Replica Diecast Truck With $75 Amsoil Order

December 6, 2023
The Role of Amsoil in Enhancing Racing Performance The Role of Amsoil in Enhancing Racing Performance
19 min read
  • Amsoil Racing and Sponsored Events
  • Articles

The Role of Amsoil in Enhancing Racing Performance

December 1, 2023
Amsoil Signature Series: A Comprehensive Review Amsoil Signature Series: A Comprehensive Review
15 min read
  • Product Reviews

Amsoil Signature Series: A Comprehensive Review

November 30, 2023
Amsoil Preferred Customer/Catalog Customer Promotion – Amsoil Cuffed Beanie $5 when they order $75 or more Amsoil Preferred Customer/Catalog Customer Promotion - Amsoil Cuffed Beanie $5 when they order $75 or more
2 min read
  • Articles
  • HistoricalPromos

Amsoil Preferred Customer/Catalog Customer Promotion – Amsoil Cuffed Beanie $5 when they order $75 or more

November 22, 2023

Contact Us:
National Synthetics

Leo & Tisha Maguire
110 Northcutt Station
Acworth, GA 30101
678-799-9062

  • Helpful Links:
    • Privacy Policy
    • Contact Us
    • Buy Direct
    • Free Catalog
  • Facebook
  • Twitter
  • Instagram
  • YouTube
Copyright © All rights reserved. | MoreNews by AF themes.