Kohler engines use specific oil filter part numbers, but many aftermarket filters work across multiple Kohler models

Kohler publishes official part numbers for each engine model, but you do not have to use them. The filter thread size, bypass valve rating, and micron filtration are what matter — and those specs are shared across Kohler's lineup and often match filters made by Fram, Motorcraft, Briggs & Stratton, and other manufacturers. A cross-reference tells you which aftermarket filters have the same specs as the Kohler original, so you can buy a cheaper or more readily available option without guessing.

The catch is that Kohler makes hundreds of engine variants, and a filter that works for a CH440 will not work for a CH620. You need your exact engine model and displacement before you can trust any cross-reference. That information is stamped on the engine block or printed on a label near the oil cap.

Key Takeaways

  • Kohler engine model and displacement (found on the engine block or label) must match before you use any cross-reference chart.
  • Common Kohler filters like the 52 050 02-S and 12 050 01-S have multiple aftermarket equivalents from Fram, Motorcraft, and other brands.
  • Thread size, bypass valve pressure, and micron rating are the specs that determine whether a filter will work; Kohler publishes these in the engine manual.
  • Online cross-reference databases from filter manufacturers and parts retailers can show you compatible options once you know your Kohler part number.
  • Aftermarket filters are often cheaper and easier to find than Kohler originals, but confirm the specs match before purchase.

How to locate your Kohler engine model and original filter part number

The engine model is stamped directly into the block, usually on the side or top near the valve cover. It looks like "CH440" or "SV590" — two letters followed by three digits. Write this down exactly. Next, find the oil filter part number, which Kohler prints in the engine manual or on a label under the oil cap or on the filter housing itself. Kohler part numbers typically start with "52" or "12" followed by five more digits, like 52 050 02-S or 12 050 01-S.

If you cannot find the label or manual, search the Kohler website by engine model. The parts diagram for your model will list the correct filter part number and its specs. You will need the displacement too — that is the cubic centimeter (cc) or horsepower rating, also stamped on the block. A CH440 is 440cc; an SV590 is 590cc. These numbers matter because Kohler uses different filters for different displacements even within the same model family.

Common Kohler filter part numbers and their aftermarket equivalents

Kohler's most widely used filters appear in many engines across their residential and commercial lines. The 52 050 02-S, for example, is found in CH440, CH460, and similar mid-range models. Fram makes an equivalent under the part number PH3593, and Motorcraft makes one as FL-400. All three have the same thread size (3/4-16 UNF), bypass valve pressure (8 psi), and micron rating (20 microns). That means any of the three will work in any engine that calls for the Kohler 52 050 02-S.

The 12 050 01-S appears in larger Kohler engines like the SV590 and SV620. Fram's equivalent is PH8170, and Briggs & Stratton makes one as 492932. Again, the specs are identical across all three. Smaller engines like the SV470 use the 52 050 01-S, which matches Fram PH3593A and Motorcraft FL-400A. The pattern holds: once you know your Kohler part number, you can find the same filter under different brand names by matching the thread size and bypass valve rating.

Where to find cross-reference information online

Fram and Motorcraft both maintain searchable cross-reference databases on their websites. Enter your Kohler part number into Fram's lookup tool, and it will show you the Fram equivalent along with the specs. Motorcraft's site works the same way. These databases are free and do not require an account. You can also call a Kohler dealer or a parts retailer like Tractor Supply or Ace Hardware with your engine model and part number, and they will tell you what aftermarket filters they have in stock that match.

Amazon, eBay, and general parts retailers often list cross-references in the product description or Q&A section. If you see a Fram or Motorcraft filter listed as compatible with your Kohler engine model, check the part number against the manufacturer's database to confirm. Some third-party sellers make mistakes, so verify before you buy.

What the filter specs mean and why they matter

The thread size determines whether the filter screws onto your engine. Kohler engines use either 3/4-16 UNF or M20x1.5 threads. If the threads do not match, the filter will not fit, and you cannot install it. The bypass valve pressure is the psi at which the valve opens if the filter clogs. Kohler typically uses 8 psi or 10 psi. If you install a filter with the wrong bypass pressure, it may open too early (letting unfiltered oil through) or too late (starving the engine of oil). The micron rating is how fine the filter mesh is — 20 microns is standard for Kohler, meaning it catches particles 20 microns and larger. A finer filter (10 microns) will work but may clog faster; a coarser one (30 microns) will flow easier but filter less.

Your engine manual lists all three specs for the correct filter. If you cannot find the manual, the Kohler website has a parts diagram for your model that includes these numbers. Never guess on bypass valve pressure or thread size — a mismatch can damage the engine.

Comparing Kohler originals to aftermarket filters

Kohler original filters cost more than most aftermarket equivalents, but they are made to Kohler's exact specifications and are always in stock at Kohler dealers. Fram and Motorcraft filters are typically 20 to 40 percent cheaper and are widely available at auto parts stores, big-box retailers, and online. Both are reputable manufacturers with long track records in small engines and automotive use. The performance difference between a Kohler original and a Fram or Motorcraft equivalent with matching specs is negligible for most users.

The main trade-off is availability and convenience. If you need a filter today and your local Kohler dealer is closed, an aftermarket filter from Ace Hardware or Amazon may be your only option. If you prefer to stick with Kohler originals, order ahead or keep a spare on hand. Some users prefer aftermarket filters because they are cheaper to replace regularly, which can encourage more frequent oil changes — a practice that extends engine life.

Steps to verify a filter before you buy

Once you have found a candidate filter, confirm it will work by checking three things. First, match the part number against the manufacturer's cross-reference database (Fram, Motorcraft, or Briggs & Stratton). Second, compare the thread size, bypass valve pressure, and micron rating to your engine manual or the Kohler parts diagram. Third, check the product listing or packaging to confirm it is rated for small engines or lawn equipment — some filters are designed for cars and will not work in a Kohler. If all three match, the filter is safe to buy.

Before you install it, inspect the filter housing on your engine to make sure it is clean and free of debris. Wipe the sealing surface with a clean cloth. When you screw on the new filter, hand-tighten it until the rubber gasket touches the housing, then turn it an additional three-quarter turn. Do not over-tighten — that can damage the gasket and cause leaks.

Frequently Asked Questions

Can I use a car oil filter on my Kohler engine?

Not usually. Car filters are designed for different thread sizes and bypass valve pressures than Kohler small engines. Using the wrong filter can cause oil leaks or improper filtration. Always match the thread size and bypass valve rating to your engine manual before installing any filter, whether it is from a car or a small engine manufacturer.

What if I cannot find my Kohler engine model number?

Check the oil cap, the valve cover, and the side of the engine block near the carburetor. If the label is worn off, contact a Kohler dealer with a photo of your engine or a description of where you use it (lawn mower, generator, etc.). They can often identify the model by appearance and tell you the correct filter part number.

Do I have to use the exact Kohler part number, or can I use any filter with matching specs?

You can use any filter with matching thread size, bypass valve pressure, and micron rating. The part number is just Kohler's way of identifying that combination of specs. An aftermarket filter with identical specs will perform the same way.

How often should I change my Kohler engine oil filter?

Kohler recommends changing the filter every time you change the oil. For residential engines used seasonally, that is typically once a year or every 50 to 100 hours of operation. For commercial or heavy-use engines, follow the schedule in your engine manual — it may be every 200 to 500 hours depending on the model and conditions.

Where can I find the specs for a Kohler filter if I have lost the manual?

Visit the Kohler website and search for your engine model. The parts diagram will list the correct filter part number and its thread size, bypass valve pressure, and micron rating. You can also call a Kohler dealer with your engine model and they will provide the specs over the phone.