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How to Read a Gear Oil Viscosity Chart

How to Read a Gear Oil Viscosity Chart

Save this chart for your own use. As an AMSOIL dealer I  use it several times weekly to show customers how things like a 20W-50 motor oil (motorcycle oil) can be also used as a gear lube.. Also how ranges of one oil is significant as a 90WT for differentials..

This comparative viscosity chart can help determine if two or more lubricants have similar viscosities.

by Joel Youngman|January 6, 2024

Viscosity, defined as a fluid’s resistance to flow, is one of the most important characteristics of a lubricant. Some of the informal terms used to describe the viscosity of a relatively free-flowing fluid, such as water, include thin, light and low. Terms such as thick, heavy or high suggest a fluid with strong resistance to flow, such as honey. However, these terms are general and difficult to measure.

More specific classifications give us a better idea of how fluids move, but you’ve likely seen at least a few different ways to designate viscosity:

Society of Automotive Engineers (SAE) grades for automotive motor oils (e.g. SAE 5W-30)

Society of Automotive Engineers (SAE) grades for automotive gear oils (e.g. SAE 75W-90)

American Gear Manufacturers Association (AGMA) grades for industrial gear lubricants (e.g. AGMA 5)

International Standards Organization (ISO) grades for hydraulic fluids and industrial gear lubricants. Established to represent a universally accepted grading system (e.g. ISO 100)

Comparative Gear Oil Viscosity Chart

Considering there are multiple standards (that use different scales) for designating viscosity, a comparative viscosity chart can help determine if two or more lubricants have similar viscosities. But how do you read a gear oil viscosity chart?

Just read it horizontally. For example, an SAE 60 motor oil has a similar viscosity to an SAE 90 gear oil, an AGMA 6 gear lubricant and an ISO 320 hydraulic fluid/gear lubricant. The corresponding kinematic viscosity and Saybolt viscosity are also referenced on the chart.

Kinematic Viscosity

Commonly seen on a lubricant’s data sheet, kinematic viscosity describes a fluid’s visible tendency to flow. Think of this as the time it takes to watch a fluid pour out of a container.

This tendency to flow is expressed in units suggesting the volume of flow over time, called centistokes (cSt). Kinematic viscosity is usually tested at both 40°C and 100°C.

Saybolt Viscosity

Although centistokes are the most common unit of measurement when determining kinematic viscosity, results may also be reported in Saybolt Universal Seconds (SUS). Viscosity reported in SUS is becoming increasingly rare, but you may still come across it when reading lubricant product information. Saybolt viscosity is usually tested at both 100°F and 210°F.

What’s the Best Oil for My Snowblower?

What’s the Best Oil for My Snowblower?

Using a high-quality, purpose-built oil can provide extra protection for your snowblower’s engine.

_by Brad Nelson|November 10, 2023

When a snowstorm hits, you need your snowblower to fire up and help you get the job done. But snowblower engines face unique challenges that can reduce their dependability, horsepower and longevity. Fortunately, there are maintenance practices that can vastly improve reliability, including using a specially engineered small-engine oil.

Using a high-quality, purpose-built small-engine oil can help improve the reliability and performance of your snowblower.

Tough on Oil

Although snowblower engines are used less frequently than other engines, they’re tougher on oil than most people realize.

Compared to liquid-cooled automotive engines, small engines usually lack oil filters, run hotter, operate under constant heavy load, generate more oil-damaging contaminants and are exposed to snow, water and extreme temperatures.

Snowblower engines are often stored in unheated garages or sheds where cold temperatures cause the oil to flow slower at startup, a key driver of engine wear.

Using a high-quality, purpose-built oil can provide extra protection for your snowblower’s engine, reducing the risk of component damage and prolonging its life.

However, most small-engine oils we’ve tested are nothing more than re-labeled automotive oils, which are formulated in large part to enhance fuel economy, not to survive the brutal operating conditions of a snowblower engine.

Although small engines are often used infrequently, they’re tougher on oil than most people realize.

Purpose-Built Protection

AMSOIL 100% Synthetic Small-Engine Oil isn’t a re-packaged automotive oil. We specially engineered it from the ground up for small-engine dependability. It’s built to solve the problems that plague small engines, including wear, power loss, oil consumption, harmful carbon deposits and stuck rings and valves.

Excellent Wear Protection

AMSOIL Synthetic Small-Engine Oil is a shear-stable, high-film-strength formulation fortified with a heavy dose of anti-wear additives. It does not thin out due to mechanical shear, ensuring a thick lubricating film. It forms a durable barrier that protects against metal-to-metal contact.

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Formulated for Power

Engine wear, carbon deposits, valve sticking and piston-ring sticking reduce engine power. AMSOIL Synthetic Small-Engine Oil prevents ring and valve sticking while helping eliminate carbon deposits from forming. As a result, engines produce maximum power throughout their service lives, helping you move more snow faster.

Extreme-Temperature Performance

AMSOIL 100% Synthetic Small-Engine Oil is formulated with a saturated molecular structure that offers outstanding extreme-heat resistance.

In addition, we’ve fortified the oil with potent antioxidant additives that provide further resistance to damaging heat.

Its powerful detergent additives fight carbon, varnish and sludge to maximize engine life.

In extreme cold, the oil’s naturally high viscosity index and lack of paraffins (waxes) ensure it remains fluid and flows quickly, providing easier cold-weather starts and fast startup lubrication for reduced wear.

Reduces Oil Consumption

In lab testing, AMSOIL 10W-30 Synthetic Small-Engine Oil reduced oil consumption 61% compared to three leading 10W-30/SAE 30 motor oils.¹

Its heat-resistant synthetic base oils provide low volatility, excellent viscosity stability and strong oxidation resistance.

Engines run longer between top-offs, providing peace of mind your engine won’t fail due to oil starvation and will run dependably.

Let it Snow

Prepare your snowblower engine for the next big storm with a specially engineered small-engine oil. AMSOIL 100% Synthetic Small-Engine Oil provides extra protection for your snowblower engine so you can throw snow like its no big deal all winter long.

¹Based on 125-hour lab tests of small engines using AMSOIL 10W-30 Synthetic Small-Engine Oil and three leading 10W-30/SAE 30 motor oils.

 

Protect Your Firearms and Improve Their Reliability

Protect Your Firearms and Improve Their Reliability

firearms oil and cleaner product by AMSOIL - Stop and prevent rust

_by David Hilgendorf | September 29, 2023

One in three Americans owns a firearm, and they need their guns to perform flawlessly when called upon. The moving parts on firearms must be cleaned and lubricated to ensure top performance and long life. It’s important to perform regular maintenance on your firearms to improve their reliability and protect them whether in use or in storage.

In an emergency you need your firearm to be without issues so you can easily take care of business.

Firearm owners typically fall into at least one of three categories.

  • Hunters typically own shotguns to hunt waterfowl or upland birds and rifles to hunt larger game.
  • Collectors and Sport Shooters own diverse types of firearms for recreational shooting, including shotguns, rifles and handguns.
  • Firearms Professionals & 2nd Amendment Patriots, including citizens tired of crime, open borders, ex military, law enforcement, gunsmiths and firearm safety instructors, work with diverse types of firearms as part of their job.

Nothing ruins a hunting trip or day at the shooting range quicker than a malfunctioning firearm. Firearms are often stored for extended periods and then subjected to field use in all sorts of environmental conditions. Opportunities to clean and maintain your guns while on a remote hunting trip are rare.

Even worse – that criminal is breaking into your house or threatening you while you are in your car. Happens every day so you want that firearm to work when it’s desperately needed.

The best solution is to clean and protect your firearm after every use, to make sure it’s ready to go the next time you need it.

AMSOIL firearm products are designed to provide outstanding firearm protection in the most demanding conditions. We’ve performed extensive testing in a variety of handguns and long guns and in our chemical lab to ensure our products provide enhanced protection, performance and reliability and are compatible with all firearm materials.

Clean, lubricate and protect

AMSOIL Synthetic Firearm Lubricant and Protectant guards against damaging corrosion better than a leading competitor’s product. It lubricates to prevent blockage, jams and wear, to extend gun life and help keep firearms working properly for generations.

  • Outstanding performance in both hot and cold temperatures
  • Lubricates and protects firearms to prevent blockage, jams and wear and help extend product life.
  • Specifically formulated to provide superior performance in firearms

AMSOIL Firearm Cleaner and Protectant is an aerosol cleaner and protectant that penetrates deep into hard-to-reach components, effectively cleaning residue from all surfaces and protecting guns for safe long-term storage.

  • Penetrates deep into hard-to-reach components
  • Cleans fouling and powder residue from all firearm surfaces, reducing misfires and increasing reliability
  • Protects guns against corrosion for safe storage and preserving performance, reliability and value

Applications

AMSOIL firearm products provide premium protection and performance in rifles, handguns and shotguns, and are safe to use on all metals, woods, composites and rubbers.

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The Difference Between GL-4 and GL-5 Gear Oil

The Difference Between GL-4 and GL-5 Gear Oil

The main difference between GL-4 and GL-5 gear oils is in the level of extreme-pressure (EP) additives.

It’s really very simple. They are not interchangeable and GL5 didn’t replace GL4.

by Eddie Yorkman,|July 5, 2022

If you’ve ever purchased gear oil, or spent any time looking at gear-oil specifications, you have undoubtedly come across the API GL-4 and GL-5 specifications. You may have wondered, what is the difference between GL-4 and GL-5 gear oil? Where can I buy GL-4 and GL-5 gear oil?

Severity – Hypoid gears vs Helical

The American Petroleum Institute (API) classifies gears using GL ratings, ranging from GL-1 to GL-5. Higher GL rating numbers represent more severe applications; GL-1 is the least severe and can usually be satisfied with a motor oil, while GL-5 is the most severe GL rating.

EP additives

The main difference between GL-4 and GL-5 gear oils is in the level of extreme-pressure (EP) additives. EP additives effectively protect gears by providing a sacrificial layer on gear surfaces; these additives are essential for protecting gears operating under heavy loads and extreme temperatures. A typical GL-5 gear oil provides about twice as much EP additive in its formulation compared to a GL-4 gear oil.

Where are GL-4 and GL-5 gear oils used?

GL-4 gear oils are typically recommended for spur and helical gears found in manual transmissions and transaxles operating under moderate speeds and loads.

GL-5 gear oils are typically recommended for hypoid gears in automotive axles operating under high-speed, high-load conditions.

What type/weight gear oil should I use?

For top protection and performance, it is best to consult your owner’s manual/Shop manual for the manufacturer’s recommendation. There, you will find both the specified viscosity (75W-90, 75W-140, etc.) and specification (API GL-4, API GL-5, API MT-1, etc.) recommended for your application. Almost all hypoid gear sets require GL-5 due to the need for significant extreme-pressure protection.

Note the 2nd number is the KEY weight under operating temperatures and conditions. 990, 110, 140, 250, etc..  For example our 75W-80 covers and overlaps the recommendations where 80W-90, 85W-90 are written.

What’s the best gear oil for my vehicle?

AMSOIL SEVERE GEAR® Synthetic Gear Lube excels in protecting gears and bearings from the rigors of severe-service operation. By design, it resists breakdown from high heat, preventing acids and maintaining a barrier to prevent metal-to-metal contact while conditioning seals. Its wax-free construction also improves cold-flow properties, improving fuel economy and cold-weather performance.

• Superior film strength
• Controls thermal runaway
• Protects against rust and corrosion
• Helps reduce operating temperatures
• Maximum efficiency
• Long oil, seal and equipment life
• Flexible easy-pack for clean, fast installation

SEVERE GEAR is recommended in differentials, manual transmissions and other gear applications requiring an API GL-5 gear oil. It can also be used in axles where an API GL-4 lubricant is recommended.

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How To Protect Your Snowmobile Engine

How To Protect Your Snowmobile Engine

_by David Hilgendorf|September 6, 2023

Manufacturers are designing today’s sleds to deliver unprecedented power and performance, so snowmobile enthusiasts can push the boundaries even further. Two-stroke snowmobiles are meant to be ridden hard, but aggressive riding and running your machine at wide-open throttle all day takes its toll on the engine.

Some models use turbocharging to produce extreme horsepower, but turbos also create intense heat and pressure with the potential to damage the engine. In these extreme conditions, deposits can form on the turbo bearing, pistons and exhaust power valves, reducing engine power and causing engine wear. 

AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil is designed to handle the challenging engine conditions created by high-performance sleds. To evaluate its performance, we installed INERCEPTOR in a Ski Doo* 850 Etec* Turbo R and ran it on our dyno for 30 hours, simulating a full season of mountain riding.

After testing, we tore down the engine and examined the parts. The synthetic base oils and advanced additives in AMSOIL INTERCEPTOR Synthetic 2-Stroke Oil prevented deposits and wear, keeping parts clean and helping to deliver maximum power and engine life.

AMSOIL INTERCEPTOR Synthetic 2-Stroke Oil is specifically designed for maximum performance in all makes of two-stroke snowmobiles, including Arctic Cat, Polaris and Ski-Doo, helping enthusiasts spend more time riding and less time performing maintenance. It is compatible with most two-stroke oils and its low-smoke, low-odor properties help ensure you enjoy every ride.

RUNS ON FREEDOM®

We’re so confident in the performance of AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil that if you run it exclusively in your current-model-year or newer sled, we’ll cover engine repairs for up to two years or 5,000 miles (8,000 km) in the unlikely event of an engine failure under our RUNS ON FREEDOM® LIMITED SNOWMOBILE WARRANTY.

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