Best Oils for Generators

Like all the other motor-driven machines, generators also need proper maintenance. This keeps their performance at par. If it is a home use generator or a commercial use generator, you will have to change the oil of the generator. You should maintain a healthy level of oil to get the best out of your generator. Not all generator oil is good for your generator, so we have mentioned the best generator oil for you!

Buying Guide 

Before buying a generator oil for your home or commercial use. Check if the oil comes with SAE 30. Society of Automotive Engineers is a standard development organization for the engineering industry. It rates the oil in terms of viscosity. The viscosity of the oil tells that how much can it flow through the components of the generator engine. SAE 30 ratings mean the time taken by the oil to reach one from end to the other end of the tube. It means that SAE 30 rated oils travel from one place to another in 30 seconds. 

There are other options too be to considered such as single-grade or multi-grade rating. SAE 30 is an example of a single-grade rating, indicating the weight of oil in warm temperatures. Multi-grading, for example, 10W-30 oil means the same as SAE 30 but the 10 here denotes the viscosity of oil in winter. 

Above all this, you need to change the oil of your generator timely to keep the performance and health of the generator engine. Keep the unit and air filter clean, along with the engine oil. Most of the generators need the oil change in 25 hours because of continuous use. It needs the oil to be changed after 50-60hours of the first change. 

Where to Buy
Pennzoil 550022686 Platinum Full Synthetic Motor Oil (SN) 5W-20, 1 Quart - Pack of 1
Briggs & Stratton 30W Engine Oil - 48 Oz. 100028
Generac 0J93230SSM 20Kw-22Kw SM 999 Maintenance Kit (Synthetic Oil)
Briggs & Stratton 100005 SAE 30W Engine Oil - 18 Oz
Idemitsu 30010092-75000C020 Full Synthetic 0W-20 Engine Oil (SN/GF-5-1 Quart), 32. Fluid_Ounces
Royal Purple 01130 API-Licensed SAE 10W-30 High Performance Synthetic Motor Oil - 1 Qt.
Honda 08207-10W30 PK2 Motor Oil
Mobil 1 Extended Performance Full Synthetic Motor Oil 0W-20, 5 Quart (120903)
Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
Schaeffer Manufacturing Co. 9001-012S Supreme 9000 Full Synthetic Racing Oil 5W-50, 1 quart

Pennzoil 550022686 Platinum Full Synthetic Motor Oil (SN) 5W-20

It comes in a pack of 6 with 32 ounces per pack. It comes with great compatibility for car engines and generator engines. Before using it in your car, you should check the car manual of your car. If you don’t need this much oil, you can buy it in smaller packs too. PurePlus technology of this oil maintains the low viscosity during lower temperatures. This maintains the optimal performance of the generator

5W-20 means that it will perform well under high temperatures too. It maintains and protects the horsepower of the engine under extreme temperatures. 

Briggs & Stratton 30W Engine Oil – 48 Oz. 100028

Air-cooled engines burn about an ounce of oil per cylinder per hour. This oil is recommended for small engines. SEA 10W-30 is for varying temperature ranges. This grade of oil improves cold-weather starting. It might increase oil consumption. Synthetic SAE 5W-30 is for the best protection of all temperatures. It is a high-quality detergent oil classified by SJ/CFAPI. 

Generac 0J93230SSM 20Kw-22Kw SM 999 Maintenance Kit

If you want to have a generator that will operate as if it was new, then you should buy this maintenance kit. It is a premium-grade maintenance kit. the maintenance kit comes with:

  • 2 spark plugs
  • Rectangular air filer
  • Synthetic oil

The oil comes with a pack of 2. Each canister holds 946ml. as it lubricates the components of the engine, it will cause fewer troubles in the future. When the oil distributes itself in all components and reduces the friction, it will minimize fuel consumption. 

Briggs & Stratton 100005 SAE 30W Engine Oil

Another option coming from the same manufacturer will hardly disappoint. It is a true synthetic oil and that is why it is one of the best-chosen oils for generators. The synthetic property of this oil implies that it will lubricate the engine components of the generator faster than the conventional oils. It keeps them lubricated in the cold winter days too. It is affordable and includes 32-ounce oil canisters. 

Idemitsu 30010092-75000C020 Full Synthetic 0W-20 Engine Oil

This generator engine oil comes in a 5-quart bottle. It comes in a 1-quart bottle too but the 5-quart bottle offers you a better price per volume. This oil is primarily designed for car engines, but most of the car engine oils are best and work well in generators. It uses advanced friction reduction technology. It promotes fuel economy because of advanced friction reduction. This oil makes the engine perform at its peak efficiency. 

It improves thermal stability, which works fine for cars and generators. It surpasses the global fuel economy requirements

Royal Purple 01130 API-Licensed SAE 10W-30 High-Performance Synthetic Motor Oil

In case you need it for several machines, you can buy it in larger and different quantities. It has a rating of SAE 5W-30. It works perfectly in cold and normal operation temperature levels. Royal Purple 01130 10W-30 is an example of synthetic oil that outperforms oils made from crude oil. It protects the engine. It uses superior additive technology. The purple color of the oil makes it easy to tell that when it needs the change. 

Honda 08207-10W30 PK2 Motor Oil

Honda is one of the trusted names when it comes to producing products. It does not only meet the needs of the customers but also surpasses them. The branded product will do what it is made to do. It does not come in a large can but it contains 32-ounce of oil. Talking about the 946-ml bottle will replace the generator oil while sparing some of the oil till top-ups. 

The major strength of this oil is its viscosity. The right viscosity of the oil distributes itself in different components quickly. This ability prevents the metal-to-metal interaction and eliminates the chances of developing rust. 

Mobil 1 Extended Performance Full Synthetic Motor Oil 0W-20, 5 Quart

For those who use high-end generators, this is the best and reliable oil. It comes in an affordable pack of 4 that provides enough for your generator. This oil uses an advanced full synthetic formula to maximize the efficiency of the generator and reduce the fuel consumption by 2%. It boasts an outstanding thermal and oxidation stability of the generator. The generator oil meets the ILSAC GF-5 so that it delivers the value that you have paid for. 0W-20 motor oil provides an impressive low-temperature capability. 

Cummins 3265336 Onan SAE 15W-40 Oil

This generator oil must not suit everyone because of its higher price. But you get what you have paid for. Cummins one of the esteemed names in manufacturing engines of all sizes. Buying this oil provides you a premium quality. It boosts the health of your generator and improves its performance. It reduces the friction in the generator engines. It minimizes the wear and prolongs the life-time service of the generator. 

For reliability, it is testing in the factory. You get long-lasting protection because of a lot of 4 oil bottles. It meets the strictest standards of performance of a generator engine. 

Schaeffer Manufacturing Co. 9001-012S Supreme 9000 Full Synthetic Racing Oil 5W-50

If you live in extremely cold areas, then this generator oil will be the best option for you under low temperatures. It does not thicken under low temperatures. It remains thin during the hot summer days. It provides optimum wear protection all the time. It does not only protect the engine but also provides a boost to the engine. The fuel consumption rate gets low which becomes saving for you. 


In this article, we have mentioned the 10 best oil generators for you. Generators also need maintenance like cars and bikes. Using one of these oils, you can run your generator smoothly, effectively, and efficiently. It will cause lesser problems for you in the future.