394018S 392642 Air Filter 492932S Oil Filter for BS 5050K 394018 295447 401417 303442 303447 305447 350447 356447 JD LG394018JD GT235 LT166 LX288 LT170 Maintenance Kit Parts

What It Is

This is a multi-piece maintenance kit containing an air filter and oil filter designed to fit specific Briggs & Stratton single-cylinder engines used in lawn tractors and zero-turn mowers. The kit includes part numbers 394018S (air filter) and 492932S (oil filter), covering common service intervals for residential and light commercial mowing.

Fitment & Compatibility

Before buying, verify your engine model number (stamped on the valve cover or blower housing). This kit fits Briggs & Stratton 5050K series engines and other models using air filter 394018 and oil filter 492932. Cross-reference with OEM numbers: 394018, 295447, 401417, 303442, 303447, 305447, 350447, 356447, JD LG394018JD. Compatible with John Deere GT235, LT166, LX288, LT170 and similar tractors with those engines. Measure your current air filter: this is a rectangular foam/paper element approx. 5.5" x 5" x 1.5". The oil filter is a spin-on type with 3/4"-16 thread and 2.5" diameter. Not for overhead valve (OHV) engines using different filters.

Key Things to Know

• Quality: Aftermarket kit; meets OEM specs but not genuine Briggs & Stratton. Some users report slightly thinner foam on the air filter compared to OEM.
• Installation: Both filters swap in minutes. Air filter slides into housing; oil filter hand-tighten only (1/2 turn after gasket contacts).
• Common gotcha: The oil filter may be slightly shorter than OEM—verify it doesn’t bottom out on the engine block. If it does, use OEM 492932S instead.
• Kit value: Buying separately costs ~$25; this kit saves ~$5-7. Good for one oil change cycle.

Should You Buy It

This is a solid budget option for routine maintenance on compatible Briggs & Stratton engines if you don’t mind aftermarket parts. It’s fine for residential mowing where absolute OEM fit isn’t critical, but avoid if you require exact OEM dimensions or run a commercial operation where filter failure costs time. For the price, it’s a decent value for a single service interval.