Briggs & Stratton 4-Cycle 30W Motor Oil 18oz

Worth it for contractors maintaining fleets of small engine equipment. The 18 fluid ounce bottle matches standard push mower capacity exactly, preventing the overfilling damage that happens with 20oz containers. 4.85 stars from 1,006 reviews — contractors praise the “exact volume needed” sizing.

This oil shines for lawn care crews, landscapers, and anyone running multiple pieces of small engine equipment through Montana’s April-to-October working season.

Precise Volume for Small Engine Protection

The 18oz sizing isn’t random. Typically 15oz to 18oz for standard push mowers — this bottle delivers the exact amount most small engines need without leftover oil sitting around the shop. Contractors running multiple mowers appreciate not measuring from larger containers or dealing with partial bottles.

SAE 30 / 30W viscosity hits the sweet spot for use SAE 30 for temperatures above 40°F. That covers Montana’s entire construction season from late April through October. The single-grade formula means less oil consumption than multi-grade alternatives in hot-running air-cooled engines.

Compatible Across Equipment Fleets

Compatible with Briggs & Stratton, Honda, Kawasaki, Kohler, Tecumseh engines — covers virtually every small engine brand on Montana jobsites. Works in lawn mowers, generators, garden tractors, trimmers, tillers, leaf blowers.

The warranty certified by Briggs & Stratton designation matters for equipment still under manufacturer coverage. Using non-approved oils can void warranties — this bottle maintains compliance across the board.

Specification	Value
Viscosity	SAE 30 / 30W
Volume	18 Fluid Ounces (approx. 532 ml)
Oil Type	Conventional / Mineral Engine Oil
Model Number	100005
Temperature Range	Above 40°F (4°C)

Maintenance Schedule That Makes Sense

Change after first 5 hours of use (break-in), then every 50 hours or annually. For contractors, that translates to mid-season changes on heavily used equipment, annual changes on backup units.

Allow engine to warm slightly before draining old oil — warm oil flows out cleaner, taking more contaminants with it. Check oil level before each use becomes second nature when you’re running equipment daily.

Reviews indicate bulk multi-packs are available — consider buying cases for fleet maintenance.

Frequently Asked Questions

What’s the difference between SAE 30 and 10W-30 for small engines?

Use SAE 30 for temperatures above 40°F (4°C); use 10W-30 for varying temperatures. The trade-off: 10W-30 offers better cold-weather starting performance but causes increased oil consumption in high-temperature air-cooled engines. For Montana’s working season, SAE 30 runs cleaner.

Can this oil be used in 2-cycle engines?

No. Not for use in 2-cycle engines (requires oil/fuel mix). This is strictly for 4-cycle engines with separate oil reservoirs.

How much oil does a standard push mower hold?

Typically 15oz to 18oz for standard push mowers; check dipstick. The 18oz bottle size prevents overfilling — a common mistake that leads to blown seals and smoking engines.

What API rating does this oil carry?

SJ (Typical for B&S single-grade small engine oil). This meets requirements for all modern small engines while maintaining the single-grade advantages for air-cooled applications.