Best Oil for Generac Generator (SAE 30, 5W30 & 10W30)

Buying the best generator from the market is not enough to get the best performance. You have to maintain your generator correctly. Selecting the right engine oil is one of the most crucial parts of maintaining the generator.

Generac recommends using SAE 30 oil at above 32°F. And 10W-30 oil for the below 40°F to -10°F. They also recommend using synthetic 5W-30 for all temperatures.

I have listed and reviewed the best SAE 30, 10W-30, and 5W-30 oil for the Generac generator. You could choose your generator according to your condition. Without further ado, let’s get started.

Oil for Generac Generator – Comparison Table

Best SAE 30 oil
Briggs & Stratton 30W Engine Oil
Briggs & Stratton 30W Engine Oil
  • Volume 1.418 L
  • Advanced 30W Engine Oil
Best 5W-30 oil
Royal Purple 11745 HMX
Royal Purple 11745 HMX
  • Volume: 946 ml
  • 5w-30 synthetic Motor Oil
Best 10W-30 oil
Valvoline - 881165
Valvoline – 881165
  • Volume: 4.73 L 
  • Synthetic SAE 10W-30 engine oil 

SAE 30 oil for Generac Generator

Briggs & Stratton 30W Engine

If you live in an area where the temperature is Above 32°F, I will recommend using this Briggs & Stratton 30W Engine Oil. Don’t think about the performance of this oil. No doubt this one is one of the best performing synthetic engine oil in the market.

This is a bottle of 48 fluid ounces. Comparing the price, this one is worthy indeed. Most importantly, this oil is not only manufactured for Briggs & Stratton generators. You could use this one for Generac smoothly.

Valvoline SAE 30 engine oil

Valvoline is one of the best conventional SAE 30 engine oil in the market. If you are comfortable with the conventional type of oil, I recommend using this engine oil for your Generac generator.

This is a 946 mL quality plastic bottle. And this one is cheaper also.

This quality SAE 30 engine oil protects your engine from deposit formation. It comes with anti-wear additives with advanced technology to ensure the best performance. If you are looking for something inexpensive but worthy, you could try this one.

5W-30 oil for Generac

Royal Purple 11745 HMX SAE 5W-30

If you are looking for a high mileage engine oil for your generator, you could consider this Royal Purple 11745 HMX SAE 5W-30. This one is a stand-out 5W-30 engine oil indeed.

This is a package of 192 fluid ounces. Also, they offer 32 fluid-ounce bottles. So, you could buy any package from the listing.

Royal Purple ensures high engine performance. It protects the generator engine from LSPI. Additionally, this is synthetic oil and comes with additive and advanced technology.

Pennzoil 550022689

Pennzoil 550022689 is another popular and high-performance full synthetic oil for Generac generators in the market. If you are from a varieties temperature regions, you could sue this Pennzoil 550022689. Generac recommends using the 5W-30 viscosity for the people like you.

Although this Pennzoil 550022689 was designed for a car, you could use it for your Generac generator. With this Pennzoil 550022689, you will get the maximum performance even with your old Generator. This one is cleaner and comes with advanced technology to maximize engine performance and save money.

SAE 10W-30 for Generac Generator

Generac recommends using the 10W-30 oil for the people living in areas where the temperature is below 40°F and down to -10°F. Here is the best Performing SAE 10W-30 for Generac Generator.

Valvoline – 881165

This one is one of the most popular SAE 10W-30 oil for the Generac generator. This 10W-30 oil is perfect for a Generac generator and standout for all types of motors.

This is a 5QT bottle, and it is equivalent to 4.73 Liter. This Valvoline engine oil is specially designed for the gasoline engine. You will get 40% more wearer protection than the industry standard oil.

So, if you are looking for the best deal on a moderate budget, you could consider this standout oil for your generator.

Royal Purple 01130

I prefer Royal Purple for its outstanding performance. This one comes with a moderate price, and the performance is standout. If you never use Royal Purple for any type of motor, you should make it a try. I believe you will feel good.

This Royal Purple 01130 API-Licensed SAE 10W-30 will increase the fuel efficiency of your Generac generator. Also, it increases the wear protection and keeps your engine well for a more extended period.


How frequently should I change the oil for my Generac generator?

For the first operation, you should change the oil after 20-30 hours of running. Then you should change the oil every 100 hours of run time. This is the recommendation from the Generac.

Can I use 5W-30 in my Generac generator?

5W-30 is the universal choice for the Generac generator. You could use this oil in any of the Generac models at any temperature. So, 5W-30 is recommended for a Generac generator.

Final Thoughts

Generac is a top-performing generator in the market. They produce outstanding inverter and open frame generators. If you use the gasoline or dual-fuel generator from Generac, please follow the user manual for regular maintenance.

You could choose any type of oil among the SAE 30, SAE 10W-30, and SAE 5W-30 oil. All are recommended for Generac generator. So you have the flexibility to choose according to your need.

Also read the review of


Rayan is an engineer, lives in a farmhouse. He has a passion for electronics and alternative energy. He loves to share his thoughts with other people. That is why he started the blog.

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