Generac Oil Filter: The Complete Guide to Choosing, Installing, and Maintaining Your Generator's Essential Component

2026-01-06

​The Generac oil filter is a critical component that protects your generator's engine from contaminants and ensures reliable performance during power outages and emergency situations.​​ Proper maintenance, including regular oil and filter changes, is essential for extending the lifespan of your Generac generator and preventing costly repairs. This comprehensive guide covers everything you need to know about Generac oil filters, from selection and installation to troubleshooting and maintenance best practices.

Understanding Generac Oil Filter Specifications

Generac oil filters are designed specifically for Generac generators and come in several part numbers to match different engine models. The most common Generac oil filter part numbers include ​070185E, ​0H9093, and ​0E7080, each engineered for specific engine types and sizes.1,2

The ​Generac 070185E​ oil filter features a 19mm thread size and is compatible with various Generac air-cooled generator models. This OEM part ensures efficient filtration of contaminants from engine oil, promoting smooth operation and extending the generator's lifespan. The filter is designed with a silicone anti-drainback valve to prevent dry starts and a metal bypass spring for increased durability.2,11

For liquid-cooled engines, the ​Generac Guardian 0E7080​ oil filter is specifically engineered for Generac's 1.6L, 2.5L, 3.0L, and 4.2L G3 engine models. This genuine OEM part provides superior filtration to keep engine oil free from harmful debris, safeguarding bearings, pistons, and other crucial engine components.6

How to Choose the Right Generac Oil Filter

Selecting the correct oil filter for your Generac generator is crucial for optimal performance and engine protection. Here are the key factors to consider:

​Thread Size and Compatibility​
Always verify the thread size before purchasing a replacement filter. The Generac 070185E uses a 19mm thread, while other models may have different specifications. Using the wrong thread size can prevent proper sealing and cause oil leaks.2

​Filter Height and Diameter​
Aftermarket filters may be slightly longer or shorter than the original OEM filter. Confirm you have enough clearance around the engine mount before installation. Even small differences in dimensions can affect fitment and potentially cause interference with other components.2

​Bypass Valve Specifications​
The bypass valve pressure rating is critical for maintaining proper oil pressure. Too high or too low can affect oil pressure and potentially damage engine components. Always choose filters with bypass valve specifications close to the OEM requirements.2

​Warranty Considerations​
Using non-OEM filters may void warranty coverage in some cases. Always keep your maintenance receipts and records to prove proper maintenance if warranty claims are needed. While aftermarket options can offer cost savings, OEM filters ensure compatibility and maintain warranty protection.2

Top Aftermarket Alternatives to Generac Oil Filters

While OEM Generac filters are ideal, several trusted aftermarket brands offer comparable performance and availability. These alternatives can be more cost-effective while maintaining quality standards:

​WIX 57145​
The WIX 57145 is a direct cross-reference for the Generac 070185E oil filter. WIX filters are known for their high filtration efficiency and durable construction, featuring a metal bypass spring and silicone anti-drainback valve.2,11

​Baldwin B7165​
Baldwin filters are recognized for their heavy-duty construction and superior filtration capabilities. The B7165 model offers excellent contaminant removal and is designed to withstand the demands of generator operation.2

​AC Delco PF2127​
AC Delco filters from General Motors feature higher burst strength and 25 to 30 micron filtration capabilities. These filters come with a 2-year warranty and are known for their durability and reliability.2,9

​AMSOIL EAO09​
AMSOIL's EAO09 filter is designed for extended performance, featuring 100% synthetic micro-glass media with 99% filtration efficiency. These filters can support extended oil change intervals while maintaining engine protection.2

​FRAM Extra Guard​
FRAM filters are praised for their dirt-trapping capabilities and affordability. The signature orange filters are suitable for daily use and can protect engines for up to 5,000 miles under normal operating conditions.9

Step-by-Step Guide to Changing Your Generac Oil Filter

Regular oil and filter changes are essential maintenance tasks for your Generac generator. Follow these steps for proper replacement:

​Preparation​
Before starting, gather all necessary tools and materials: new oil filter, appropriate wrench, drain pan, clean rags, and the recommended oil type. Ensure the generator is on a level surface and has cooled down if recently operated.3,4

​Draining the Oil​

  1. Warm up the engine for at least five minutes to thin the oil, then shut down the generator.
  2. Place a drain pan under the oil drain plug.
  3. Clean the area around the oil drain plug and remove it using the appropriate wrench.
  4. Allow the oil to drain completely into the container.
  5. When oil has drained, install and tighten the drain plug securely.5

​Removing the Old Filter​

  1. Locate the oil filter on the engine.
  2. Turn the oil filter counterclockwise to remove it. Use an oil filter wrench if necessary, but avoid excessive force.
  3. Wipe clean the filter mounting surface on the engine to remove any dirt or old gasket material.3,4

​Installing the New Filter​

  1. Apply a light coat of clean engine oil to the gasket on the new filter.
  2. Screw the new filter onto the adapter until the gasket lightly touches the mounting surface.
  3. Hand-tighten the filter an additional 3/4 turn. Do not overtighten, as this can damage the gasket or cause oil leaks.
  4. Wipe the filter clean to remove any oil or debris.3,4

​Refilling with Oil​

  1. Remove the oil dipstick and fill the crankcase with the recommended oil type.
  2. For most Generac air-cooled engines, SAE 5W-30 synthetic oil is recommended for year-round use.
  3. The engine crankcase typically holds about 1 quart (950ml) of oil.
  4. Do not fill above the FULL mark on the dipstick.
  5. Install and tighten the dipstick cap before operating the engine.5

​Checking for Leaks​

  1. Start the engine and let it run for a few minutes.
  2. Check for oil leaks around the filter mounting base and drain plug.
  3. Shut the engine down and let it sit for 5 minutes.
  4. Re-check the oil level and adjust as necessary to reach the full mark on the dipstick.
  5. Dispose of the old oil and filter in accordance with applicable regulations.3,4

Recommended Maintenance Schedule

Generac provides specific maintenance intervals to ensure optimal generator performance and longevity:

​Initial Break-In Period​
Change the engine oil after the first 8 hours of operation. This initial oil change removes any metal particles and contaminants from the break-in process.5

​Regular Maintenance Intervals​
After the initial break-in, change the oil and filter every 100-200 hours of operation or annually, whichever comes first. If operating consistently under heavy load or at high ambient temperatures, change oil more frequently.5,11

​Complete Tune-Up​
For comprehensive maintenance, perform a complete tune-up that includes oil and filter change, air filter replacement, and spark plug replacement. This ensures peak engine efficiency and longer service life.11

Common Issues and Troubleshooting

Understanding common oil filter problems can help you identify and address issues before they cause significant damage:

​Incorrect Threading​
Even if the diameter looks correct, thread pitch differences can prevent proper sealing. Always verify the thread specifications match your generator's requirements before installation.2

​Filter Not Seating Properly​
Some users report that filters with different gasket placement may not seal on certain Generac engines. Ensure the new filter has the same gasket design and placement as the original.2

​Overtightening​
Hand-tighten the filter ¾ turn after gasket contact. Over-torquing can damage the gasket, cause oil leaks, or make future removal difficult. Use only hand pressure for the final tightening.2,3

​Low Oil Pressure Warning​
This could occur if the filter's bypass valve or anti-drainback valve operates differently from the OEM version. Always compare the new filter's specifications to the original Generac filter before installation.2

​Oil Leaks​
Check for loose connections, damaged seals or gaskets, and cracked housing. Tighten all connections and replace damaged components as needed.12

​Reduced Oil Flow​
A clogged filter can restrict oil flow. Replace or clean the filter element according to the manufacturer's instructions. Ensure the oil viscosity is appropriate for the operating temperature.12

​High Oil Pressure​
A clogged filter can cause high oil pressure. Replace the filter and check the pressure relief valve for proper operation. Ensure the oil viscosity is appropriate for your operating conditions.12

Understanding Oil Filter Failure Causes

Several factors can contribute to oil filter failure and reduced performance:

​Filter Plugging​
The filter gets clogged with contaminants such as varnish, sludge, and debris, causing a significant increase in pressure differential across the filter and reduced filtration efficiency. Regular oil changes help prevent excessive contamination.14

​Pore Erosion​
Metallic particles or abrasive debris cause wear and erosion of the filter media, leading to larger pore sizes and reduced particle capture. This can allow contaminants to circulate through the engine.14

​Filter Warping​
Operational stresses, including pressure, flow, and temperature cycles, can cause the filter to warp and potentially result in fatigue cracking. This can compromise the filter's structural integrity.14

​Media Migration​
The cumulative effect of plugging, pore erosion, and warping can lead to partial or complete rupture of the filter structure, compromising its filtration capability and potentially releasing captured contaminants back into the oil flow.14

Benefits of Using Quality Generac Oil Filters

Investing in genuine Generac oil filters or high-quality aftermarket equivalents provides several important benefits:

​Engine Protection​
Quality filters effectively capture contaminants and impurities from engine oil, preventing them from circulating and causing damage to internal components. This critical filtration process helps maintain oil cleanliness and promotes efficient lubrication.1,6

​Extended Engine Life​
By removing harmful particles from the oil, quality filters reduce wear and tear on engine components. This extends the overall lifespan of your generator and helps avoid costly repairs.1,6

​Improved Fuel Efficiency​
Clean oil allows the engine to run more smoothly, reducing friction and, consequently, fuel consumption. This translates into cost savings over time, especially for users who rely on their generators frequently.15

​Reliable Performance​
During power outages or emergency situations, having a properly maintained generator with a clean oil filter ensures reliable power output when you need it most.15

​Warranty Compliance​
Using genuine Generac parts helps maintain warranty coverage and ensures your generator operates according to manufacturer specifications.2

Proper Disposal of Used Oil and Filters

Used engine oil and oil filters contain contaminants that can harm the environment if not disposed of properly:

​Oil Disposal​
Never pour used engine oil down drains, on the ground, or into trash. Take used oil to a certified collection center or recycling facility. Many auto parts stores and service centers accept used oil for recycling.3,4

​Filter Disposal​
Oil filters should be drained completely before disposal. Many municipalities require oil filters to be recycled rather than thrown in the trash. Check local regulations for proper disposal methods in your area.3,4

When to Seek Professional Help

While many Generac generator owners can perform basic maintenance themselves, certain situations may require professional assistance:

  • If you're unsure about the correct filter for your generator model
  • If you encounter persistent oil leaks after filter replacement
  • If the generator shows signs of low oil pressure or unusual noises
  • If you're not comfortable performing maintenance tasks yourself
  • For warranty-related maintenance that requires professional documentation

Conclusion

Proper maintenance of your Generac generator, including regular oil and filter changes, is essential for reliable performance and long service life. By understanding the different Generac oil filter options, following the correct installation procedures, and adhering to the recommended maintenance schedule, you can ensure your generator provides dependable power when you need it most. Always use the recommended oil type and quality filters to protect your investment and maintain optimal performance.

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