Kohler Oil Filter 12 050 01: What It Is, What It Fits, and What You Need to Know

The Kohler oil filter part number 12 050 01 (sometimes written as 1205001 or 12-050-01) is one of the most searched small engine oil filter numbers online — and for good reason. It shows up on a wide range of Kohler-powered equipment, from lawn tractors to zero-turn mowers to generators. Understanding what this filter does, how to verify fitment, and what your replacement options look like can save you time and help you avoid a costly mistake at the parts counter.

What the Kohler 12 050 01 Oil Filter Does

Like any oil filter, the 12 050 01 removes contaminants — metal particles, dirt, soot, and oxidized oil byproducts — from the engine oil as it circulates through the lubrication system. On small engines like those found in riding mowers and outdoor power equipment, clean oil is especially important because these engines often run hard under load (cutting thick grass, hauling attachments) and may go longer between changes than a passenger car engine would.

The 12 050 01 is a spin-on canister-style filter, meaning it threads directly onto an oil filter adapter on the engine block and contains the filter media, bypass valve, and anti-drainback valve inside a self-contained steel can. When you change the oil, you unscrew the old filter and thread on a new one — the whole assembly is replaced each time.

What Equipment Uses the Kohler 12 050 01 Filter

This filter number was originally associated with Kohler Command and Courage series engines, which are air-cooled single- and twin-cylinder engines commonly used in:

• Riding lawn mowers and lawn tractors
• Zero-turn mowers
• Garden tractors
• Residential and commercial generators
• Pressure washers and other outdoor power equipment

Specific engine families frequently cited for this filter include the CV, CH, CS, and SV series engines — though the exact fitment depends on the engine's displacement, model year, and the equipment manufacturer's configuration.

⚠️ Do not assume this filter fits your engine based on the part number alone. Always cross-reference using your engine's model number and spec number, which are typically stamped on a metal tag on the engine itself.

How to Read Your Kohler Engine's Model and Spec Numbers

Kohler engine tags include several numbers that matter for parts lookup:

Using the model and spec together in Kohler's parts lookup or a cross-reference tool gives you the confirmed filter number for your engine — not a guess based on what "looks right."

Cross-Reference and Aftermarket Equivalents

The 12 050 01 has been cross-referenced with filters from multiple manufacturers. Common equivalents cited in parts databases include numbers from Purolator, Wix, Fram, and Champion (among others), though the exact cross-reference should be verified against a current compatibility chart, since filter manufacturers update their lineups and part numbers change over time.

When using an aftermarket filter, look for these specs to match the OEM filter:

• Thread size and pitch (must match the engine's filter adapter)
• Filter height and diameter (affects clearance and oil capacity)
• Bypass valve pressure rating (too low and it bypasses prematurely; too high and dirty oil circulates)
• Anti-drainback valve (prevents dry starts by keeping oil in the filter between uses)

A filter that physically threads on but has the wrong bypass pressure or no anti-drainback valve can cause real damage over time — which is why using verified cross-references matters more than using whatever happens to fit.

How Often to Change This Filter 🔧

Kohler's general guidance for equipment using this engine family is to change the oil and filter:

• After the first 5 hours of use on a new engine (break-in change)
• Every 50 hours of operation thereafter, or at least once per season

These are baseline intervals. If the equipment runs in dusty or dirty conditions, or handles heavy loads regularly, more frequent changes protect the engine better. Oil that looks dark or smells burnt has already done more work than it should.

Why the 12 050 01 Is Sometimes Listed as Discontinued

Kohler has updated and consolidated part numbers over the years. The 12 050 01 has in some product lines been superseded by newer Kohler filter part numbers. If a dealer or parts site shows this number as discontinued or back-ordered, ask for the current superseding part number directly from Kohler's parts catalog or a Kohler-authorized dealer. Using a superseded number without confirming the replacement can lead to ordering the wrong filter.

What Shapes the Right Answer for Your Situation

Even if the 12 050 01 is the correct filter for your engine on paper, several things affect what replacement actually makes sense:

• Your engine's model and spec number — determines confirmed fitment
• Current Kohler part number status — superseded numbers need to be traced to current equivalents
• OEM vs. aftermarket preference — both can work, but aftermarket quality varies by brand and filter line
• Where you source parts — dealer, big-box retailer, and online suppliers all carry different inventories and may stock different cross-reference equivalents
• Your equipment's age and condition — older engines sometimes have worn filter threads or adapters that need attention during a filter change

The filter number is a starting point, not the whole answer. Your engine's tag is where the real lookup begins.