Generac Generator Oil Guide: Capacity, Type, and Maintenance Tips

Recommended Oil Types for Generac Generators

Generac provides clear guidelines on which oil types to use based on your generator’s operating conditions. Here’s what you need to know:

Conventional vs. Synthetic Oil

• Conventional Oil: Used for the initial break-in period of the generator. It is recommended to use conventional oil for the first 20-30 hours of operation to allow the engine components to properly seat and wear in.
• Synthetic Oil: After the first oil change (at 20-30 hours of use), you can switch to synthetic oil, like SAE 5W-30. Synthetic oil provides superior protection, longer oil change intervals, and better performance in extreme temperatures. However, switching too early can prevent the engine from breaking in properly, so it’s crucial to wait until after the initial break-in period.

For Most Climates

• SAE 10W-30 Oil: This is the standard oil type recommended for most Generac generators operating in moderate climates. It offers good viscosity and lubrication for typical temperatures and is readily available.

For Cold Weather (Below 40°F)

• SAE 5W-30 Synthetic Oil: If you frequently operate your generator in colder temperatures, switching to SAE 5W-30 synthetic oil is recommended. This oil type provides better performance in cold conditions, ensuring smoother starts and better engine protection during operation.

Oil Capacities for Popular Generac Generators

Here’s a detailed breakdown of the oil capacities and recommended oil types for Generac standby generators from 16kW to 24kW:

Generac 16kW

• Oil Capacity: Approximately 1.7 quarts.
• Recommended Oil Type: SAE 10W-30 for most climates; use SAE 5W-30 synthetic oil in temperatures below 40°F.
• Oil Change Schedule: First change after 20-30 hours of use, then every 100 hours or annually.

Generac 18kW

• Oil Capacity: Approximately 1.8 quarts.
• Recommended Oil Type: SAE 10W-30 for general use; SAE 5W-30 synthetic oil for cold weather.
• Oil Change Schedule: Initial change at 20-30 hours, then every 100 hours or once a year.

Generac 20kW

• Oil Capacity: Approximately 1.9 quarts.
• Recommended Oil Type: Use SAE 10W-30 for standard climates and SAE 5W-30 synthetic for colder environments.
• Oil Change Schedule: First oil change at 20-30 hours of operation, followed by changes every 100 hours or annually.

Generac 22kW

• Oil Capacity: 1.9 to 2 quarts.
• Recommended Oil Type: SAE 10W-30 for most conditions; switch to SAE 5W-30 synthetic oil in temperatures below 40°F.
• Oil Change Schedule: After 20-30 hours for the first change, then every 100 hours or once per year.

Generac 24kW

• Oil Capacity: 2 quarts.
• Recommended Oil Type: SAE 10W-30 is recommended for general climates; use SAE 5W-30 synthetic oil for cold conditions.
• Oil Change Schedule: Initial change at 20-30 hours, then follow up every 100 hours or yearly.

Key Reminders Across Models (16kW – 24kW)

• Always check the oil level before each use and maintain it within the manufacturer’s recommended range.
• Choose the correct oil type based on the climate in which your generator operates.
• Follow the regular maintenance schedule to ensure efficient performance and extend the life of your Generac generator.

How Often to Change Oil in a Generac Generator

Regular oil changes are a crucial aspect of maintaining your Generac generator. The frequency of oil changes can vary based on your generator model and how often you use it, but here are the general guidelines:

First Oil Change

For all Generac models, the initial oil change should be performed after the first 20-30 hours of operation. This is because, during the break-in period, small metal particles can accumulate in the oil as the engine components settle in. Changing the oil after this period ensures these particles are removed and the engine is protected.

Routine Oil Changes

After the initial oil change, oil changes should occur every 100 hours of use or once per year, whichever comes first. For portable generators, oil should be changed every 50 hours or seasonally, especially if the generator is used frequently or for extended periods.

High-Usage Situations

If your Generac generator is running continuously or in high-demand situations, such as extended power outages, it’s wise to check the oil level daily and perform oil changes more frequently, roughly every 50-60 hours of use.

Consider the Environment

• Hot or Dusty Conditions: If the generator operates in extremely hot or dusty conditions, more frequent oil changes are recommended to keep the engine clean and properly lubricated.
• Cold Conditions: Use SAE 5W-30 synthetic oil in colder climates and follow the same change intervals, ensuring smooth performance.

Checking and Changing Oil in a Generac Generator

Regularly checking and changing the oil in your Generac generator is key to keeping it in top working condition. Here’s a step-by-step guide to help you:

How to Check Oil Level

1. Turn Off the Generator: Make sure the generator is off and has cooled down for safety.
2. Locate the Oil Dipstick: On standby models, the dipstick is usually near the oil fill area. For portable models, check the manual for the exact location.
3. Wipe and Check the Dipstick: Remove the dipstick, wipe it clean, reinsert it fully, then pull it out again to check the oil level.
4. Refill as Necessary: If the oil level is low, add the recommended oil type in small increments, rechecking the dipstick until the correct level is reached.

How to Change the Oil in a Generac Generator

1. Gather Your Tools & Supplies: You’ll need a funnel, an oil pan to catch the old oil, a suitable oil filter wrench, and the recommended oil.
2. Warm Up the Generator: Run the generator for a few minutes to warm up the oil (it will flow out more easily).
3. Drain the Old Oil: Place the oil pan underneath the oil drain plug, remove the plug, and let the oil completely drain out.
4. Replace the Oil Filter: Use the filter wrench to remove the old filter and install the new one. Lubricate the gasket of the new filter with some fresh oil before installing.
5. Refill with New Oil: Use a funnel to pour in the new oil. Start with the recommended capacity and check the dipstick to ensure the proper fill level.
6. Dispose of Old Oil Properly: Ensure that the used oil and filter are disposed of according to local regulations.

Note: Always follow the specific recommendations found in your Generac model’s manual to ensure proper oil changes.

Maintenance Plans for Long-Term Care

Consider enrolling our maintenance plan to ensure your generator is serviced regularly and properly by professionals. A maintenance plan provides the convenience of scheduled oil changes, professional checks, and peace of mind that your generator is always ready for use.

Maintenance Plans: The Best Way to Care for Your Generac Generator

Maintaining your Generac generator is essential, but it can be easy to overlook routine oil changes and checks. That’s where a maintenance plan can provide significant benefits:

Why Choose a Maintenance Plan?

• Convenience: Scheduled maintenance ensures you never miss an oil change or necessary check-up.
• Professional Expertise: Certified technicians will use the correct oil type and capacity for your specific Generac model, ensuring optimal performance.
• Peace of Mind: Regular maintenance keeps your generator ready to perform when you need it most, especially during emergencies.

Benefits of a Maintenance Plan

• Long-Term Savings: Consistent care reduces the risk of costly repairs and extends the life of your generator.
• Timely Service Reminders: You’ll receive timely reminders to keep your generator on schedule for routine maintenance.
• Comprehensive Care: A full maintenance plan covers not only oil changes but also filter replacements, overall system checks, and any necessary adjustments.

Frequently Asked Questions

1. What Type of Oil Should I Use in My Generac Generator?

Generac generally recommends using SAE 10W-30 oil for most climates. However, if your generator operates in temperatures below 40°F, SAE 5W-30 synthetic oil is preferred to help the engine start and run smoothly in cold conditions.

2. How Often Should I Change the Oil in My Generac Generator?

The first oil change should be performed after 20-30 hours of operation to clear out any debris from the engine break-in period. Afterward, change the oil every 100 hours of use or annually. For portable generators, change the oil every 50 hours or seasonally, depending on usage.

3. Can I Use Automotive Oil in My Generac Generator?

While automotive oil may seem similar, it’s best to use the oil type specifically recommended by Generac, such as SAE 10W-30 or SAE 5W-30 synthetic oil. This ensures proper engine lubrication and performance.

4. Can I Use Synthetic Oil Right from the Start?

It’s recommended to wait until after the first 20-30 hours of operation before switching to synthetic oil. This break-in period allows engine components to settle in properly. Afterward, you can safely use SAE 5W-30 synthetic oil for better performance and longer intervals between oil changes.

5. What Happens If I Overfill My Generac Generator with Oil?

Overfilling the oil can cause problems like engine smoking, fouled spark plugs, and even damage to the engine components. It’s essential to add oil slowly and use the dipstick to ensure the oil level is within the proper range.

6. Can I Run My Generator Without an Oil Filter Change?

Changing the oil filter is just as important as changing the oil. The oil filter removes contaminants and debris from the oil, ensuring the engine runs smoothly. It is best practice to change the oil filter during every oil change to maintain optimal engine performance.

7. How Do I Dispose of Used Oil and Filters?

Used oil and filters should be disposed of properly according to local regulations. Many automotive shops and recycling centers accept used oil and filters for proper disposal. Never pour used oil down drains or in the trash.

8. How Can I Check the Oil Level in My Generac Generator?

To check the oil level, turn off the generator and let it cool. Locate the oil dipstick, remove it, wipe it clean, reinsert it fully, and then pull it out to check the oil level. The oil should be between the “low” and “full” marks on the dipstick. If needed, add the recommended oil type in small amounts until the correct level is reached.

9. What Are the Signs That My Generator Needs an Oil Change?

• Decreased Performance or Power Output: If your generator is not running as smoothly or producing less power.
• Dirty or Discolored Oil: If the oil appears dark or gritty, it’s time for a change.
• Oil Leaks: Regularly inspect your generator for any oil leaks or oil pooling beneath the unit.

10. Is It Necessary to Change the Oil if I Only Use My Generator Occasionally?

Yes, even if your generator is used infrequently, the oil can degrade over time and collect moisture, which can lead to engine damage. Therefore, it’s recommended to change the oil annually, regardless of usage.

11. Can I Extend the Oil Change Interval if I Use Synthetic Oil?

While synthetic oil can offer better protection and longer intervals, it’s best to stick to Generac’s recommended oil change schedule of every 100 hours or annually for standby generators and 50 hours or seasonally for portable models, to ensure optimal engine health.

12. How Can I Make Oil Changes Easier?

• Have the Right Tools on Hand: Funnel, oil pan, and an oil filter wrench.
• Perform Regular Checks: Regularly checking oil levels before operation ensures you’re never caught off guard.
• Use a Maintenance Plan: Enrolling in a maintenance plan allows professionals to handle all oil changes and checks, saving you time and ensuring your generator stays in top condition.

13. What Happens If I Don’t Change the Oil in My Generac Generator?

Failing to change the oil regularly can lead to engine damage, reduced performance, and potential failure during operation. Old oil loses its lubricating properties and can allow harmful debris to circulate through the engine, causing wear and possible breakdowns.

14. Should I Use a Fuel Stabilizer in My Generator Along with Regular Oil Changes?

Yes, especially if your generator is used infrequently. Fuel stabilizer can prevent fuel degradation and ensure that the generator starts up reliably when you need it. Always follow manufacturer recommendations for fuel and oil maintenance.

15. What Are the Benefits of Enrolling in a Maintenance Plan?

A maintenance plan ensures regular, scheduled oil changes and comprehensive checks performed by certified technicians. This helps extend the life of your generator, reduces the risk of unexpected failures, and provides you with peace of mind knowing that your generator is always ready to perform when needed.

If you have more specific questions about maintaining your Generac generator or want to learn more about our maintenance plans, please don’t hesitate to contact us.