Briggs and Stratton 5135B Maintenance Kit

What It Is

The Briggs & Stratton 5135B Maintenance Kit is a pre-assembled set of oil and filter components designed for routine servicing of small engines, primarily in walk-behind mowers, riding mowers, and lawn tractors using Briggs & Stratton engines. It’s intended for one-time oil changes and filter replacements to keep engines running smoothly.

Fitment & Compatibility

• Engine models: Fits most Briggs & Stratton single-cylinder engines with a side-mount oil filter (e.g., Intek, Endurance, and some Vanguard series). Check your engine’s model number against the kit’s compatibility list on the manufacturer’s site.
• Deck size: Not deck-specific; compatibility depends on engine type, not mower deck dimensions.
• OEM vs aftermarket: This is an OEM kit, so it’s built to factory specs. Aftermarket alternatives may offer cheaper parts but lack warranty consistency.
• Measurements: The kit includes a 20 oz (591 ml) bottle of SAE 30 oil (or 10W-30, depending on variant) and a standard spin-on oil filter. Verify your engine requires a spin-on filter (not a cartridge) and uses the same oil viscosity as in the kit.
• Check before buying: Confirm your engine’s oil capacity (most small engines take 18–20 oz) and filter thread size (typically 3/4"-16). If your engine uses a different oil weight or a larger filter, this kit won’t work.

Key Things to Know

• Quality: OEM parts mean reliable fit and filtration; the oil meets API service class SJ or higher, suitable for most air-cooled engines.
• Installation difficulty: Easy for DIYers—takes about 15 minutes with basic tools (wrench for filter, funnel for oil).
• Common gotchas: The kit may not include a drain pan or gloves. Also, over-tightening the filter can cause leaks—hand-tighten then 1/4 turn.
• Gotcha: If your engine has a horizontal shaft (common on push mowers), this kit works; vertical shaft engines (on some tractors) also use it, but double-check filter location.

Should You Buy It

Buy it if you own a Briggs & Stratton engine with a spin-on filter and want a one-stop, OEM-backed maintenance solution for a quick oil change. It’s ideal for seasonal upkeep or after winter storage, but skip it if your engine uses a cartridge filter, different oil weight, or if you prefer buying oil and filter separately to save a few dollars.