Kohler 12 050 01-s1 Oil Filter

What It Is

The Kohler 12 050 01-s1 is a spin-on oil filter designed for Kohler Command, Courage, and other small-engine series used in lawn tractors, zero-turn mowers, and commercial mowing equipment. It removes contaminants from engine oil to protect critical components during operation.

Fitment & Compatibility

Before buying, confirm your engine model and filter thread size. This filter fits Kohler engines with a 3/4-16 UNF thread and a gasket diameter of roughly 2.5 inches. It replaces OEM numbers 12 050 01-S1, 12 050 01, and 25 050 01-S. It is not universal—check your engine’s model number (e.g., CH, CV, or KT series) by looking on the engine shroud or valve cover. Cross-reference with aftermarket filters like Fram PH6607 or Wix 51358 only if you verify dimensions and bypass valve specs. Avoid using on engines requiring a shorter or longer filter canister (e.g., some Kawasaki or Briggs models).

Key Things to Know

• Quality: OEM Kohler construction with anti-drainback valve and proper bypass pressure for consistent oil flow. Aftermarket filters may lack these features, risking engine wear.
• Installation: Easy—hand-tighten only after lubricating the gasket with fresh oil. Over-tightening can damage the seal or housing.
• Common Gotchas: Always drain oil before removal; the filter can be hot and full of oil. Check for old gasket stuck to the engine block—double gaskets cause leaks.
• Change Interval: Replace every 100 hours or at the start of each mowing season, whichever comes first.

Should You Buy It

If you own a Kohler-powered mower and want a no-hassle, reliable fit that matches OEM specs, this filter is the right choice. For non-Kohler engines or budget builds, a cheaper aftermarket option may work, but you risk fitment or performance issues. Stick with this for peace of mind on your primary mower.