What Is The Best Oil For A Generac Generator?

Generac is one of the best generators ever produced. However, purchasing the best generator available does not guarantee the best performance. You need oil high-quality oil designed to lower friction and keep your generator running. Do you want to know which oil is ideal for this type of generator? We looked online to find information to assist you in this matter, and this is what we found.

The best oil for a Generac generator is those having a Society of Automotive Engineers (SAE) rating of:

  • SAE 30 (above 32°F)
  • SAE 10W-30 (between -10°F and 40°F)
  • SAE 5W-30 (all temperatures)

In this article, we’ll go into further detail about the Generac generator oils. Additionally, we'll discuss several oils that fit each of these SAE classifications as well as how they affect generator engines. So keep on reading.

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What Is The Best Oil For A Generac Generator?

Generac GP7500E

Backup (sometimes referred to as standby) generators are a great option to give your house consistent, uninterrupted power in the event of a power loss. 

Generac, which was established in 1959, is the leading producer of home backup generators, offering clients superior comfort and peace of mind in times of need.

To have the optimum performance for your Generac generator, you must carefully maintain it. And one of the most important aspects of maintenance is picking the proper engine oil. Below are some of the best oil you may choose:

SAE 30 (Above 32°F)

SAE created a classification scheme based on the universally used oil's viscosity. Viscosity ratings for motor oil typically range from 0 to 50. 

According to the system the SAE has established, SAE 30 denotes an oil with a viscosity of 30. Given that it only has one viscosity grade, the oil is referred to as a single grade (or monograde). This is graded for a hot viscosity grade which is ideal for summer use.

Ideal SAE 30 For Generac Generator 

STP Premium Small Engine 4 Cycle Oil

This oil is specifically designed for small engines and has several features to help them run longer and more effectively. The viscosity of this STP oil is kept under control to stop it from becoming thinner as it degrades. 

At high temperatures, it forms a protective layer that lessens deterioration and prolongs the life of the generator's motor.

Click here to see this STP engine oil on Amazon.

Briggs & Stratton 100028 Engine Oil

While other oils from Briggs & Stratton are intended exclusively for small engines, this 100028 engine oil isn't. Although a small engine-specific mix is preferable for generators, this oil is nonetheless warranty-certified and advised for all of their motors including generators.

You shouldn't use it in your 2-cycle motor since it's intended solely for 4-cycle engines. You will not use as many bottles overall because this oil comes in a larger 48-ounce container.

Click here to see this Briggs & Stratton engine oil on Amazon.

Valvoline Daily Protection Motor Oil

In 1866, Dr. John Ellis created one of the greatest motor oil formulas of all time, Valvoline. While this motor oil no longer holds the top spot in terms of sales, the company nevertheless appreciates its high standing and works hard to maintain it.

This premium SAE 30 engine oil guards against the buildup of deposits in your engine. To assure the greatest performance, it includes modern technology anti-wear compounds. You might give this one a try if you're looking for something affordable but worthwhile.

Click here to see this Valvoline motor oil on Amazon.

SAE 10W-30 (Between -10°F And 40°F)

Compared to SAE 30, 10W-30 is thinner. The "30" indicates that when the engine is hot, it has the same viscosity as SAE 30. 

However, because it is thinner, it will never get as thick as SAE 30 when it gets cold. Because 10W-30 has a viscosity of 10W (suffix W denotes winter), it will continue moving and shielding engine parts at a lower temperature. For those who live in regions with cold areas, this is essential.

In comparison to 5W-30, this oil is slightly thicker at low temperatures, although still relatively fluid, which makes it a little more difficult to start your engine. It has a thicker consistency, uses less fuel, and lubricates engine parts only moderately. 

Ideal 10W-30 For Generac Generator 

Castrol 03129C Edge High Mileage

Since this oil is designed to keep high-mileage vehicles running longer, it would be a fantastic option to keep your generator going longer as well. 

But there are advantages beyond simply extending life. The additional fluid titanium technology in this oil boosts oil film strength by up to 30% while lowering breakdown.

The fuel economy will improve when you use this oil. You won't need to replace it as frequently as you would with non-synthetic oils because it is a 100% synthetic formula. Additionally, this mixture is designed to be 10 times more resistant to the thickening of high-temperature oil.

Click here to see this Castor motor oil on Amazon.

Honda 08207 Motor Oil

The American Petroleum Institute (API) classifies this oil as SN oil. It is one of the top oils currently on the market, according to this classification. This classification indicates that it is one of the top oils on the market right now. 

Additionally, using this premium Honda oil in your generator's engine ensures that it runs smoothly as it lubricates quickly. As a result, you use less fuel and ultimately save money.

Click here to see this Honda motor oil on Amazon.

Royal Purple High-Performance Motor Oil

A relatively new player on the market, Royal Purple was founded in 1986. However, its synthetic generator oil is well-known and widely used. This synthetic oil works better with fuels including ethanol and improves fuel economy (essential for generators as well).

You should give Royal Purple a try if you've never used it for a motor of any kind. Using this motor oil can help your Generac generator run more efficiently. Additionally, it improves wear protection and maintains the health of your engine for a longer time.

Click here to see this Royal Purple motor oil on Amazon.

SAE 5W-30 (All Temperatures)

Pllastic motor oil canisters with different types of motor oil on white isolated background.

Because this oil is more fluid at lower temperatures, starting your cold engine is significantly simpler. It flows faster, thins out more quickly at high temperatures, and is more fuel-efficient. It offers superior lubrication to 10W-30 oil which is more feasible for general use.

Ideal 5W-30 For Generac Generator 

Generac Full Synthetic Motor Oil

Given that Generac is known for producing a variety of generators of the highest caliber, it makes sense that they have some knowledge of the oil requirements for generators. That is why the original equipment manufacturer (OEM) oil for Generac generators is this synthetic motor oil.

It's a synthetic base with extra special additives to guarantee years of trouble-free operation for your generator. You get greater viscosity breakdown protection with this oil, ensuring that your oil continues to function properly over time as opposed to simply when you first change it. 

Additionally, this oil keeps varnish and sludge deposits from building up inside your engine, assuring continued performance. It's the best and safest solution for Generac generators in particular. 

Click here to see this Generac motor oil on Amazon.

Briggs & Stratton 100074 Engine Oil

Briggs & Stratton is a reputable manufacturer of small engines such as generators. Not just engines but also this 100074 motor oil for small engines. 

This oil might contribute to the long lifespan of Briggs & Stratton motors. Since it is entirely synthetic, you may go longer between changes and it will offer superior defense against heat and friction.

Click here to see this Briggs & Stratton engine oil on Amazon.

Amazon Basics Full Synthetic Motor Oil

In comparison to other oils you could use in your generator, it is a fantastic alternative that helps you save a lot of money. You will undoubtedly discover the precise oil you require because it is available in a variety of weights.

This oil has a longer lifespan and offers your generator's engine additional protection against wear because it is totally synthetic. 

This specific mixture is particularly appealing to anyone worried about their carbon footprint because it is designed to resist heat breakdown while lowering exhaust emissions.

However, the side of the bottle typically has a clear stripe with graded markings so you can see how much oil is left. This makes it simple to replenish exactly the right amount, but these Amazon bottles lack that essential component. 

Even so, the oil is excellent and among the best generator oils available. Also, it is advised that you maintain a spare oil bottle on hand for accurate filling.

Click here to see this Amazon motor oil on Amazon.

How To Pick The Correct Generator Oil?

Motor oil pouring

When purchasing a precise type of oil for your portable generator, read the guide below:

  • Read the maintenance guide section of your generator's user manual to learn the particular type of oil that your generator engine needs.
  • Only purchase oil from reputable manufacturers approved by the SAE.
  • Determine if your generator is having 2 or 4-stroke engines as different types of oil are required for various engine types. 
  • Consider the operating temperature because some oils are created specifically to be used at certain temperatures.
  • Check to see if the oil's viscosity meets the requirements of the generator. It represents the flow resistance of the fuel. The number with the letter W stands for cold temperature, whereas the number without a letter is for hot temperature. As the numbers rise, the oil thickens.


Changing the oil on a portable generator.

You can pick any oil from the lists mentioned above because they are all suitable for Generac generators. However, you should verify the surrounding temperature because certain oils only work properly or give their best in Generac generators at certain temperatures. 

Before you go, check out some other interesting articles we have below.

Why Is My Generator Only Powering Half The House?

How To Start A Generator That Has Been Sitting [For Years]

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