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Generac Generator Oil - The Complete Guide

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Home standby generators from Generac provide automated backup power in the event of a blackout, allowing you to keep your family secure even while you're away.

They begin operating in a matter of seconds and continue until your utility power is restored, if necessary. Oil changes, new air filters, spark plug checks, and valve clearance adjustments are all part of routine maintenance for your generator.

However, one of the most important generator maintenance tasks involves checking and maintaining the oil levels. When power shortages demand running the generator for extended periods of time, oil levels should be checked daily.

To do this, turn the generator off and check the oil level according to the directions in the owner's manual. If the oil level is low, add some of the specified oil. then adhere to instructions to restart the generator.

Which kind of oil should I use for my generator?

Generac 5-Pack Full Synthetic Motor Oil 5W-30 SN Quart Bottle Part# 0J5140

I recommend Generac 5W-20 GEO Full Synthetic Oil for your home standby generator. This oil was developed for use in gaseous engines like the one found in your home's backup generator and others.

A generator is an expensive investment; by maintaining it using this oil, you can keep your money in your pocket for longer. This oil can be used in both cold and warm climates.

When operating a portable generator, it is recommended that you use Generac 5W-30 Full Synthetic Oil. There is are no temperature threshold for using this oil. For temperatures exceeding 32 degrees Fahrenheit, use SAE 30.

Within the temperature range of -10 to -40 degrees Fahrenheit, 10W-30 should be used. Synthetic 5W-30 can be used in any climate. Oil should be replaced after the first 20-30 hours of use and then again after every 100 hours of use.

How is oil rated?

Standard Automotive Engine (SAE) 30 oil is a great example of a product with a single grade rating. Specifically, it discusses the change in oil density that occurs when oil is heated, which, as we've seen, affects oil viscosity.

The problem with this rating system is that it generalizes too much about oil behavior at different temperatures.

In contrast, a multi-grade classification for oil, such as 10W-30, more accurately reflects the oil's actual properties. The SAE 30 rating defines the same qualities as the number 30 in this rating, which indicates the weight of oil at room temperature.

In cold (W) weather, the viscosity of oil is represented by the number 10.

How often to change the oil

Changing the oil on your generator on a regular basis will help it last longer and protect it from damage.

An oil change is recommended every 20–30 hours for the first 100 hours of use, and then every 100 hours thereafter. The maximum operating period can be extended to 200 hours by using synthetic oil.

The following is the recommended schedule for oil changes:

  1. The recommended break-in oil change is at 20 hours.
  2. once every three months, if possible.
  3. 100 hours of operation time.

While some generators feature built-in run time meters, some require you to keep track of the time by hand. If you're not sure what the best time frame is, more often is better than not enough.

Does Synthetic Oil Work in My Generator?

If your gas generator takes synthetic oil, you can use it. This type of oil is said to provide better coating, but only engines with overhead valves actually benefit from it.

Using synthetic oil in your generator is totally risk-free. Overheating was an issue in the early days of small engines. You can rest easy knowing they are no longer in danger of this.

The main disadvantage of using synthetic motor oils in your generator is the price. These oils are quite costly compared to regular oils, but their durability is unrivaled.

Know what engine you have

The type of engine used within your generator, whether it is a 2-stroke or 4-stroke, is another consideration when deciding on the correct oil.

The research shows that 2-stroke engines make up a very minor share of generators, while 4-stroke engines are used by the industry giants.

Depending on the engine, you'll need to use a specific kind of oil.

When operating a 2-stroke engine, as opposed to a 4-stroke engine, you can choose between purchasing a pre-mixed solution or mixing the fuel and engine oil yourself according to the recommended ratio.

Should you buy oil from premium brands?

Never skimp on generator engine oil because of the price. Spend a little more on well-known brands instead than opting for a cheaper option first.

We believe that all high-end brands are reliable and produce nothing but high-quality items. If you want to stock up on high-quality oils at a reasonable price, you should check out the sales on Amazon.com.

Be aware, nevertheless, that not all motor oils are suitable for use in all generators.

Generac Motor Oil review

Generac 0J5323A Full Synthetic SAE 5W-30 Engine Oil 5-Quart Bottle

This oil is made for all generators, so they are obviously a good option for Generac generators, especially if you live in cooler locations. 

ADVANTAGES:

  1. Developed specifically for use in generators.
  2. Exceeds even the greatest required level of API.
  3. Protects against buildup of deposits.

SPECIFICATION:

  1. SAE 5W-30.
  2. API SN.
  3. It is a synthetic oil.

An alternative oil type often recommended by manuals is SAE 5W-30. This oil is appropriate for generators that will be used in somewhat colder environments since it facilitates an easier start and improves viscosity at lower temperatures.

Our best option for full synthetic motor oils is Generac. This manufacturer is well-known in the portable generator industry due to the high volume of portable and standby units they produce.

As the name suggests, this synthetic oil has been fortified with modern additive technology.

API SN Level 1 is the highest classification that can be achieved for this product (also ILSAC GF-5).

And this oil was developed for gasoline-powered generators in particular to provide the best possible resistance to viscosity breakdown.

It also prevents varnish and sludge deposits from accumulating on critical engine parts.

Even though the Generac SAE 5W-30 oil is fantastic, running a generator in hotter weather might increase oil consumption. So, make sure you check the levels more often. 

Generac Maintenance Kit

Generac 0J93220SSM Maintenance Kit w/ 5W-30 Synthetic Oil

You should know when it's time to change the oil and filter to complete your knowledge of oil maintenance. Your generator's engine will run more efficiently and reliably as a result. You can use a Generac Maintenance Kit to do this work yourself or with the help of a local repair dealer.

To what end do I need a generator service kit?

Planned maintenance is the best way to keep your home standby or portable generator in perfect working order and in line with the terms of your warranty.

Not doing routine maintenance on your generator could lead to similar problems as not changing the oil on your car. Maintaining your generator on a regular basis safeguards your investment, extends its life, and ensures that it will always function reliably when you need energy.

What is the best repair kit for me?

The right repair set must be acquired based on the generator's kilowatt rating, engine size, and year of production. It is recommended that you consult your owner's manual to determine which replacement components should be included in your repair kit. Get in touch with your neighborhood Generac Authorized Service Provider for expert advice and support.

What parts does the kit have?

Each service plan comes with Generac-specific OEM parts, Generac 5W-20 GEO Full Synthetic Engine Oil for Home Standbys, and Generac 5W-30 Full Synthetic Engine Oil for Portable Generators. 

In order to keep your portable or home standby generator in good working order, you can purchase kits that contain everything you need. Typical components of a maintenance kit include the aforementioned oil, and filters, spark plugs, oil, quart bottles, a funnel, shop towels, and a maintenance reminder card.

Depending on the output of your generator, the specified amounts of each component may need to be adjusted. Please consult your generator's owner's handbook when deciding the repair kit to purchase.

To what extent does a repair kit typically cost?

A maintenance package can protect your investment at a reasonable price. If you don't keep up with regular maintenance on your generator, you risk having the engine break down and other problems.

By keeping up with the recommended maintenance schedule, you may extend the life of your portable or standby generator and keep your guarantee in effect.

However the specific cost of the Generac Maintenance Kit depends on the generator model you have. 

When should I have my generator serviced?

If you want information on how to perform a certain service, look in the manual. I recommend contacting an Independent Authorized Service Dealer for all of your service and maintenance needs. After the first 25 hours of use, you should change the oil and inspect and adjust the valves on your home backup generator. 

Both the 14kW and 18kW models use 816cc engines with hydraulic lifters, so they never need their valves adjusted. These machines often don't need an oil change after the first 25 hours of use. 

The battery's health, charge, and leakage must be checked annually, and so must the fuel system for signs of water incursion. Always or at the beginning of each use, make sure the fuel and oil lines are clear, the engine oil is at the proper level, and the vehicle is clean. 

Both the oil and oil filter need to be swapped out every two years or 200 hours, whichever comes first. Checking and replacing components including spark plugs, valve clearance, sediment traps, and air filters should be done every 400 hours or every four years, whichever comes first.

Is there anything I need to do to keep myself safe when I'm maintaining my generator?

I recommend finding a local Independent Authorized Service Dealer to handle any generator servicing needs. Before carrying out any maintenance activities on your own, go to your owner's manual and make sure you comply with all safety laws.

In order to keep your home's standby running, you must first turn off your Main Line Circuit Breaker (MLCB) from the utility (open). Turn off the generator by turning the main breaker off and lifting the generator's cover (open). 

Allow the generator to run and cool down for one minute without any load if it is being used during a utility outage. The generator can be turned off by pressing the off button on the controller. To be safe, take off the 7.5A fuse.

Prior to performing any repair on your portable generator, ensure it has been turned off and allowed to cool.

In order to avoid injury, you should take off any jewelry or watches before doing maintenance on portable or home standby generators.

Always use safety goggles when repairing your generator. Wearing gloves is recommended to prevent skin irritation caused by engine oil.

Cleaning up any drippings of old or new oil when you're done is a must.

When working with an air filter, you should always use clean hands or gloves.

Diesel-powered generators should be allowed to cool down before refueling to prevent gasoline from splashing onto hot engine parts.

Keep kids and animals far away from the generator while you work on it.

Clear the area around your generator of snow, weeds, and any other impediments. You need at least three feet of space around your generator on all sides.

What kinds of extras might we need?

Generac provides a variety of add-ons to help you get the most out of your purchase. There are a variety of home standby items available to provide you peace of mind in the event of a power outage, including as the Mobile Link, Tank Utility, SureStart Soft Starters, and cold weather kits.

With Mobile Link, you may receive updates about your generator's current status from anywhere with an internet connection.

Tank Utility is a great product, and it's much better now that it's compatible with Mobile Link for usage with your liquid propane equipment. Find out how much liquid propane is left in your tank with the help of the Tank Utility LTE Fuel Level Monitor.

SureStart Soft Starters reduce the stress placed on your generator by your air conditioner or heat pump's start-up. SureStart protects sensitive equipment from power outages and keeps lights from dimming when these programmes are launched.

The portable generator accessories that you need can be purchased from Generac. To get the most out of your portable generator, you should employ the utilization of extension cords, power inlet boxes, and manual transfer switches.

Extension cords ranging in amperage from 30 to 50 amps are available for use with power inlet boxes and manual transfer switches.

Generac also offers extension cables with various connecting points for generators with outputs that vary from 30 to 50 Amps. All of our extension cables are made from high-quality rubber to withstand the outdoors.

Manual transfer switches allow you to connect your portable generator to hardwired devices. In the event of a blackout, test your portable generator to be sure it can run your furnace, sump pump, and lights.

Power inlet boxes provide a safe connection between your portable generator and a transfer switch (PIBs). In the event of a blackout, you may easily power your PIB by connecting its output from your generator to one end of a power cord.

Final thoughts

Generac's generators are constructed to last and come at a reasonable price. But if you want them to really last, you need to give them some TLC.

One of the most effective methods is to keep up with oil changes and never let the oil get too low. Generac Motor Oil is just as good as any of the other well-known oil brands.

About Tom Bell

Hey, I’m Tom, the owner of Generator Reviews! I built this website to help you get the very most out of your generator and select the correct one for your personal circumstances. This site contains reviews of virtually every generator, detailed buying guides, as well as maintenance advice to help you keep yours in tip-top shape!

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Generator.Reviews is an independent review business. I am not affiliated with any manufacturers and do not accept paid reviews. When you buy through my links, I may earn a commission which helps me to maintain this website and keep the reviews coming your way!

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