The CV40 uses a Briggs & Stratton 492932 or 492932S spin-on oil filter

The Briggs & Stratton CV40 is a small commercial engine found in pressure washers, generators, and lawn equipment. It takes a spin-on oil filter, not a cartridge or foam type. The correct part number is 492932 or the updated version 492932S. Both are identical in function and fit — the "S" designation straightforward indicates a later production run.

You can find these filters through Briggs & Stratton dealers, online parts retailers, and some hardware stores that stock small-engine supplies. The filter costs between $8 and $15 depending on the seller. If you cannot locate the exact part number, cross-reference it with your engine's manual or contact a local Briggs & Stratton authorized dealer, who can confirm the filter in seconds.

The CV40 engine manual specifies changing the oil filter every 100 operating hours or once per season, whichever comes first. If you run the engine in dusty conditions, change it more often. Always change the oil and filter together — a new filter with old oil defeats the purpose of either.

Key Takeaways

  • The CV40 requires Briggs & Stratton part number 492932 or 492932S, a spin-on filter that costs $8 to $15.
  • Change the filter every 100 operating hours or once per season, and always replace it when you change the oil.
  • Briggs & Stratton dealers and online parts suppliers stock this filter, and it is not interchangeable with filters from other manufacturers.
  • If you cannot find the exact part number, your engine's manual or a local dealer can confirm the correct filter in one call.

Where to buy the 492932 filter

Briggs & Stratton authorized dealers are the most reliable source. They stock the filter in-house and can confirm fitment on the spot. Search "Briggs & Stratton dealer near me" or visit the company's dealer locator on their website.

Online retailers including Amazon, eBay, and small-engine parts sites like Jacks Small Engines and Tractor Supply carry the 492932. Prices are usually lower online, but you pay for shipping unless you may have access to for free delivery. Local hardware stores and Ace Hardware locations sometimes stock it, though availability varies by location.

When ordering online, verify the part number in your cart before checkout. Filters that look similar may not fit the CV40, and returning a wrong part costs time and money.

How to change the oil filter on the CV40

Turn off the engine and let it cool for at least 10 minutes. The filter sits on the side of the engine block and is warm after running. Locate the spin-on filter — it looks like a small metal cylinder with a threaded base.

Place an oil drain pan underneath the filter to catch residual oil. Use an oil filter wrench (a metal band tool that grips the filter) to turn it counterclockwise. Hand-tighten the new filter clockwise until the rubber gasket on top makes contact with the engine, then turn it an additional three-quarter turn by hand. Do not use a wrench to tighten — hand-tight is correct, and over-tightening damages the gasket and makes removal difficult next time.

Refill the engine with the correct oil type and amount as specified in your manual. The CV40 typically uses SAE 30 or 10W-30 depending on climate. Check the oil level with the dipstick before starting the engine.

Oil filter cross-reference and compatibility

The 492932 is a Briggs & Stratton original part. Some aftermarket manufacturers produce filters that fit the CV40, but cross-referencing is essential because filter threads and gasket sizes vary. A filter that threads on may not seal correctly or may restrict oil flow.

If you find a filter listed as compatible with the CV40, verify the part number against Briggs & Stratton's official documentation or ask the seller for a compatibility statement in writing. Cheap filters that fit loosely or leak oil will damage the engine far more than the cost of an original part.

Briggs & Stratton does not recommend using filters from other engine manufacturers on the CV40, even if they appear to fit. Stick with 492932 or 492932S to avoid warranty issues and engine damage.

Checking your manual for the exact filter specification

Your CV40 engine came with a manual that lists the correct filter part number, oil type, and change intervals. If you still have the manual, look for the "Maintenance" or "Service" section — the filter specification is always there.

If you lost the manual, read a PDF from the Briggs & Stratton website by entering your engine's model and serial number. The serial number is stamped on the engine block, usually near the top or side. You can also contact a Briggs & Stratton dealer with your serial number and they will email or print a manual for you.

The manual also specifies the correct oil viscosity for your climate and the oil capacity in ounces or milliliters. Using the wrong oil or overfilling the crankcase will cause leaks and poor engine performance.

Common mistakes when replacing the CV40 oil filter

The most common error is over-tightening the filter with a wrench. The rubber gasket on the filter's top is designed to seal when hand-tight plus three-quarter turn. Tightening it further crushes the gasket, causing it to leak or stick so hard that removal requires cutting it off with a tool.

Another mistake is forgetting to fill the new filter with oil before installation. Some technicians pre-fill the filter with fresh oil to reduce air in the system on startup. If you do this, pour oil slowly into the filter's opening until it reaches the bottom of the threads, then install it. If you skip this step, the engine runs dry for a few seconds after startup, which is not ideal but not catastrophic on a small engine.

A third error is installing the filter upside down or cross-threading it. The filter only threads one way — if it does not turn smoothly by hand, stop and check the angle. Forcing a cross-threaded filter damages the engine's filter port and requires professional repair.

Frequently Asked Questions

Can I use a different brand of oil filter on the CV40?

No. Briggs & Stratton specifies the 492932 for the CV40, and using a different filter risks poor oil flow, leaks, or engine damage. Aftermarket filters may fit but do not seal correctly. Always use the original part number.

How often should I change the oil filter?

Change the filter every 100 operating hours or once per season, whichever comes first. If you use the engine in dusty or dirty conditions, change it more often. Always change the oil and filter together.

What happens if I over-tighten the oil filter?

Over-tightening crushes the rubber gasket, causing oil leaks. It also makes the filter extremely difficult to remove next time — you may need to cut it off with a tool. Hand-tighten the filter until the gasket contacts the engine, then turn it three-quarter turn more and stop.

Where is the oil filter located on the CV40?

The spin-on filter is mounted on the side of the engine block. Consult your manual or engine diagram for the exact location, as placement varies slightly depending on how the engine is mounted in your equipment.

Do I need to drain the oil before changing the filter?

You should change the oil and filter together during regular maintenance. If you are only changing the filter between oil changes, place a drain pan underneath to catch residual oil that spills when you remove the old filter.