Generac Generator Oil-What Type of Oil is Best?

If you didn’t know, a low oil level could potentially cause significant damage to your Generac generator, leading to costly and unwanted repairs. Also, using a low-quality Generac generator oil risks damaging the vital components of your device.

Generac has cemented its reputation as the manufacturer of some of the highest quality portable or standby generators with more than six decades in the industry. But, regardless of the type of Generac generators you have, you must practice a few maintenance routines to ensure your generator remains in top condition at all times.

Proper maintenance will help boost your generator’s lifespan. And one of the most critical maintenance services is examining and adjusting your generator’s oil level.

If you are currently looking for the best Generac generator oil, you are in the right place. We will provide you with an extensive review of the three best generator oils suitable for your Generac generator.

Top 3 Best Generac Generator Oils


Generac 5W30 Synthetic Oil

As already mentioned, Generac is a famous brand that manufacturers top-notch generators for nearly all types of applications, ranging from home to industrial use. And continuing their brand’s quality offerings is the full synthetic oil, designed specifically for Generac generators.

Thanks to its synthetic nature, the Generac 5W30 Synthetic Oil is a high-performing and versatile oil that you can use in both summer and winter without any problem. It is worth noting that the high-end synthetic base is specially formulated with a highly advanced additive for optimal performance. It also guarantees complete protection against viscosity breakdown.

The fully synthetic oil features substances that offer adequate protection from sludge and varnish deposits. Its robust synthetic base fortified with a highly efficient additive ensures users obtain a full-proof shield against any form of breakdowns caused by viscosity.

This is a great feature to consider, bearing in mind that generators generally stay for long stretches without use. The synthetic Generac generator oil exceeds all the API as well as SN service classification requirements.


Generac SAE 10W-30 Oil 

Here is another top-notch engine lubricant that is perfect for the Generac portable generator that features four-cycle engines. Even though it is non-synthetic oil, it meets and exceeds SN API specification requirements and lubricates fairly faster to significantly minimize both the wear and tear associated with regular generator use.

With a viscosity of 10-30, this oil is somewhat thicker but still will enhance performance in all weather conditions.

According to the American Petroleum Institute, this is an SN oil. The Generac SAE 10W-30 oil is a fantastic product that will make your Generac air-cooled engines run smoothly, significantly reducing fuel consumption and preventing frequent repairs.

It is also worth noting that the Generac SAE 10W-30 oil is deliberately designed for gasoline Generac generators to offer optimum protection against viscosity breakdown. Besides, it protects against the formation of varnish and sludge deposits on individual components of your gasoline engines.

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Generac 20Kw Maintenance Kit (Synthetic Oil)

Natural products have always been traditionally considered superior’ to their synthetic counterparts. However, in the case of motor engine oils, experts have successfully developed a range of synthetic products that boast somewhat better properties.

More precisely, synthetic oils guarantee enhanced performance because they are manufactured using highly advanced chemical processes. And this particular Generac maintenance kit synthetic oil is not only designed to flow more easily at start-up temperatures, which is when most wear occurs, but also offers resistance to heat.

Besides offering commercial-grade wear protection, this high-quality Generac generator oil also boasts corrosion and antirust ingredients for maximum protection during periods of inactivity. In addition, the Generac 20kW Maintenance Kit includes 5w30 synthetic oil that has been fortified with an additive to prevent the viscosity from forming sludge or breaking down, both of which impact performance. Still, it can damage your precious tool as well.

The Generac Maintenance Kit (Synthetic oil) has also added genuine OEM Generac internal components, paper funnel, paper towel, and oil pan to help boost the overall performance of your engine. In addition, it is highly versatile engine oil that is ideal for the 20Kw Generac, Centurion, Guardian, Honeywell, Siemens, and Eaton Evolution series residential automatic generators.


Generator Maintenance Tips

After purchasing and installing your ideal generator, it can be tempting to sit back, relax and enjoy your hard work. However, the reality is that generators, just like any other machine, do require regular maintenance such as changing your spark plugs to function optimally.

Routine generator maintenance helps your air-cooled engines run smoothly and allows you to spot any potential issues as they develop (you should get a Generac maintenance kit).

The last thing you want is to invest your hard-earned money in a home backup generator only for it to fail or malfunction when it’s most needed! And this is why it’s vital to always take great care of your generator. Below are proven, practical, and effective generator maintenance tips to help ensure your unit remains in tip-top condition at all times:

Examine your generator’s oil levels right after installation. After all, your generator may have been shipped without any oil. And if your installer didn’t add oil, make sure you do.

Run your generator weekly

You wouldn’t purchase a car only to abandon it in the garage for months without using it. And it is the same with a backup generator. A few hours of operation a week is all it takes to keep your device fresh and ready to use.

Experts highly recommend running the generator at load or full capacity for about 20 minutes once every week. A few hours of operation full load allows the engine operating at hot temperatures and allows the lubricating oil to circulate within the engine system freely.

Check the coolant and oil levels

Once a month, you should check the oil and coolant levels. These two fluids are essential for the proper functioning of your power generator. If you didn’t know, one of the most common reasons generator malfunctions is low coolant or low oil. Here are some tips to keep your oil in check.

  • Change your generator’s oil more regularly, at the baseline outlined in the owner’s manual.
  • Take into account your manufacturer’s guidelines regarding the best type of oil for your generator. Various generators require different oils depending on the fuel and engine type.
  • Check your oil levels with the oil stick and change accordingly after a power outage that needs your unit to run for an extended period. This way, it will be ready for use the next time you need to rely on it.
  • Always keep an additional oil filter on hand, so you are prepared to change the oil more often during power outages when your backup generator may be forced to run for many hours consecutively. If possible, change to a new oil filter anytime you change your generator’s oil.
  • When either performing an oil change or checking oil levels, always remove dirt and debris from the area.

Additional Generator Maintenance

Depending on your location, you may have to perform a few additional generator maintenance tasks to guarantee the performance of your device.

For example, any generator requires a sufficient amount of air to function correctly. And if yours is located in an area with significant overgrowth, make sure you change the air filter and clear away leaves, vines, and other unwanted foliage.

During winter, you may have to remove snow from the unit after a storm. On the other hand, you have to evaluate the area to ensure no rodents have taken up residence in an enclosed system. In case you didn’t know, small critters can interfere with your unit’s normal functioning.

Schedule routine generator maintenance by a professional

You have been able to keep your generator in tip-top condition for the last six months. Nevertheless, there are a few maintenance tasks you’ll need an expert to complete. It is highly recommended that you hire a technician every six months to conduct a detailed inspection of your backup generator.

Generac strongly recommends that you utilize only an experienced, authorized Generac installer for safety and compliance with all local, state, and national electrical codes.

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generac generator oil Frequently Asked Questions (FAQs)

Generally, the type of oil you’ll use on your generator largely depends on the underlying temp conditions. In this regard, above 320 F, use SAE 30. On the other hand, below 400 F down to -100 F, go for 10W-30. It is imperative to note that the synthetic 5W-30 Generac oil is a versatile one that you can use in all temperature conditions.

Experts recommend that you should change your Generac generator’s oil after the first 20-30 hours of operation. After that, you should also change the oil after every one hundred hours of runtime thereafter, or every two years, whichever happens first.

How many quarts of oil does a Generac generator take?

Generac generator engine capacity usually ranges between 1.1 and 1.9 quarts, depending on size.

So, how do I fill the oil on my generator?

  • Start your generator and let it run for a few minutes for it to warm up.
  • Next, please turn it off and remove and subsequently wipe off the dipstick. Finally, reinstate it fully into the engine, remove it once again and observe the oil level as indicated on the dipstick.
  • Add oil only as needed. Note that overfilling could easily cause damage to the engine.

How do I remove stale gasoline?

Slightly tilt your generator so that all of the fuel slides to one side and subsequently runs out of the fuel line that’s not connected to the gas tank.

Next, turn on your fuel valve to safely drain the rest of the fuel from the unit.

Finally, reconnect the fuel line and shut the lid on the fuel tank, and finally put the cover back on.


Conclusion on generac generator oil

Just like any other machine in your home, routinely servicing and maintaining your Generac generator helps prevent it from untimely breakdowns or requiring costly repairs. And the more attention you give to your precious appliance, the better it will work and the longer it will last.

As already explained, one of the best ways to maintain your generator and keep it in peak condition is by routinely changing its engine oil. But with potentially endless types of generator oils to choose from, the prospect of finding the best product can prove to be an overwhelming task.

Thankfully, we have provided you with a review of the three best Generac generator oils to cater to your maintenance needs. With any of these fantastic engine oils at your disposal, you’ll be sure to keep your generator fully functional at all times.

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