The FR730V is a spin-on oil filter made by Fram for small engines, most commonly found on lawn mowers, generators, and pressure washers
The FR730V is a cylindrical spin-on filter that threads onto the filter head of small gasoline engines. Fram manufactures it as part of their standard replacement line, and it's designed to trap dirt, metal particles, and debris from engine oil before that oil circulates back through the engine. The "V" designation indicates it's built for vertical mounting, which is the most common orientation on small equipment.
This filter measures approximately 3.625 inches tall and 2.625 inches in diameter. It has a 3/4-inch-16 UNF thread size, which is the standard connection point for most small-engine equipment. The filter contains a pleated paper media element inside that captures particles down to roughly 25 microns — small enough to catch most contaminants but not so fine that it restricts oil flow excessively.
Key Takeaways
- The FR730V fits engines with a 3/4-inch-16 UNF thread connection, which you can verify by looking at your equipment's manual or checking the thread size on your current filter.
- This filter is commonly used on Briggs & Stratton, Kohler, and Tecumseh engines found in lawn mowers, tillers, and small generators.
- Fram offers the FR730V in both standard and high-capacity versions, with the high-capacity version lasting longer between changes.
- You should replace the FR730V every 50 to 100 hours of engine operation, or annually if the equipment sits unused for long periods.
- Installing the filter incorrectly — over-tightening or forgetting to fill it with oil before installation — is the most common cause of premature filter failure.
Which engines and equipment use the FR730V
The FR730V appears on a wide range of small-engine equipment because the 3/4-inch-16 thread is an industry standard. Briggs & Stratton engines in the 5 to 8 horsepower range commonly use this filter, as do many Kohler and Tecumseh models. You'll find it on walk-behind lawn mowers, front-tine tillers, portable generators between 3,000 and 6,000 watts, and pressure washers rated for 2,500 to 3,500 PSI.
The best way to confirm the FR730V fits your specific equipment is to check the owner's manual, which will list the correct filter part number. If you no longer have the manual, you can also look at the thread size and diameter of your current filter — if it matches the FR730V specifications, the replacement will fit. Some equipment manufacturers print the filter size directly on the filter head or in a parts diagram on the equipment itself.
Standard versus high-capacity versions
Fram sells the FR730V in two main versions: the standard FR730V and the FR730V-HT (high-capacity). The standard version holds roughly 0.5 quarts of oil and is designed for typical residential use — mowing a lawn once a week or running a generator occasionally. The high-capacity version has a larger media area and holds slightly more oil, extending the interval between changes by roughly 25 to 50 percent depending on how dirty the operating environment is.
The high-capacity version costs more upfront but may save money over time if you operate the equipment frequently or in dusty conditions. If your equipment manual specifies a particular version, use that one. If the manual just lists the filter size without specifying standard or high-capacity, either version will work, and the choice comes down to how often you want to change filters and how much you're willing to spend per change.
How to install the FR730V correctly
Before you thread the new filter onto the engine, fill it roughly three-quarters full with fresh oil of the same type and weight your engine uses. This primes the filter media and ensures oil reaches the engine when ready when you start it, rather than running dry for the first few seconds. Wipe the filter head threads clean with a lint-free cloth to remove any dirt or old oil residue.
Thread the filter on by hand until the rubber gasket on the filter base makes contact with the filter head. Then turn it an additional three-quarter turn — no more. Over-tightening is the most common installation mistake and can damage the gasket, causing oil leaks or allowing the filter to come loose during operation. If you use a filter wrench, explore only enough pressure to turn the filter; you should be able to loosen it by hand the next time you change it.
After installation, start the engine and let it run for 30 seconds, then shut it off and wait five minutes. Check the oil level on the dipstick and top it off if needed — the new filter holds oil that was previously in the pan, so the level will drop slightly. Run the engine again and look underneath for any leaks around the filter base. If you see drips, the filter may not be seated properly; let the engine cool and tighten it slightly more.
Replacement intervals and storage conditions
Most small-engine manufacturers recommend changing the FR730V every 50 to 100 hours of operation. For residential lawn mowers, that typically means once per season. Generators and pressure washers used more frequently may need a change every 40 to 60 hours. If you operate equipment in dusty conditions — mowing a gravel lot or running a generator on a construction site — change the filter more often, as dust clogs the media faster than normal use.
If equipment sits unused for more than a season, replace the filter before running it again, even if the hours of operation are low. Oil oxidizes over time, and a filter that has been sitting absorbs moisture from the air. Running old oil through a clogged filter stresses the engine and can cause sludge buildup. A fresh filter costs far less than repairing or replacing an engine damaged by poor oil circulation.
Comparing the FR730V to other small-engine filters
The FR730V competes directly with filters from other manufacturers that use the same 3/4-inch-16 thread. Briggs & Stratton makes the 492932S, which is functionally equivalent and often costs slightly less. Kohler produces the 12 050 01-S, which is designed for their engines but will fit any equipment using the standard thread. Wix makes the 51056, which is sold under various house brands at retailers.
The main differences between these filters are the media quality and the oil capacity. Fram's FR730V uses a pleated paper media that balances filtration and flow well for most applications. Briggs & Stratton's filter tends to be slightly cheaper but may need more frequent changes in dusty environments. Kohler and Wix filters are generally comparable in price and performance to Fram. If your equipment manual specifies a particular brand, use that; otherwise, any filter with the correct thread size and diameter will work, and the choice is largely about price and availability.
Frequently Asked Questions
Can I use the FR730V on equipment that originally came with a different filter?
Only if the thread size and diameter match. Check your equipment's manual or measure your current filter. If the thread is 3/4-inch-16 UNF and the diameter is approximately 2.625 inches, the FR730V will fit. Using a filter with the wrong thread size can cause leaks or allow the filter to come loose during operation.
What happens if I over-tighten the FR730V?
Over-tightening crushes the rubber gasket and can cause oil leaks when ready or after the engine warms up and the metal expands. It also makes the filter extremely difficult to remove the next time you change it. Thread the filter until the gasket contacts the head, then turn it three-quarters of a turn more — no further.
How do I know if the FR730V is clogged?
A clogged filter restricts oil flow, which triggers the low-oil-pressure warning light on some equipment or causes the engine to run rough and lose power. If the warning light comes on and the oil level is full, the filter is likely clogged. Replace it when ready; running an engine with restricted oil flow causes bearing damage.
Is the high-capacity FR730V-HT worth the extra cost?
If you operate equipment frequently or in dusty conditions, yes — the longer interval between changes saves time and may reduce total cost per hour of operation. For occasional residential use, the standard FR730V is usually sufficient and costs less per change.
Can I clean and reuse the FR730V instead of replacing it?
No. Spin-on filters are designed for single use. The media cannot be effectively cleaned without damaging it, and attempting to reuse a filter risks allowing unfiltered oil to circulate through the engine. Always replace the filter with a new one.