Opti-4 43444 1 Gallon SAE 30W 4-Cycle Engine Lubricant for up to 31 HP, 2-Pack

What It Is

This is a 2-pack of SAE 30W 4-cycle engine lubricant from Opti-4, designed for air-cooled engines up to 31 HP. It’s ideal for push mowers, riding mowers, lawn tractors, and zero-turn mowers that require straight-weight oil in warmer temperatures.

Fitment & Compatibility

Before buying, confirm your mower’s engine is 4-cycle (not 2-cycle) and requires SAE 30W oil—check the owner’s manual or oil cap. This oil is compatible with most Briggs & Stratton, Kohler, Kawasaki, Honda, and Tecumseh engines up to 31 HP. It works for both new and older engines, but avoid using it in engines that specify multi-viscosity oil (e.g., 10W-30) unless the manual states SAE 30W is acceptable in warm weather. No special measurements needed—just ensure your engine’s oil capacity is less than 1 gallon (most mowers take 18–48 oz).

Key Things to Know

• Quality: SAE 30W is a single-grade, high-viscosity oil that performs best in temperatures above 40°F. It provides excellent protection for hot-running air-cooled engines.
• Installation: Zero difficulty—simply pour into the oil fill tube. No mixing or special tools required. Use a funnel to avoid spills.
• Common gotchas: This is not synthetic or multi-viscosity. If your mower sits in cold storage or is used in sub-freezing temps, SAE 30W can thicken and cause hard starting. Also, check if your engine has a low-oil sensor that might require a specific oil type.
• Value: At $149.99 for 2 gallons, it’s a premium price. Single gallons are often cheaper unless you need bulk for multiple machines or frequent changes.

Should You Buy It

Buy this if you have multiple 4-cycle mowers or plan to do several oil changes and want a high-quality, single-grade oil for warm-weather operation. It’s overkill for a single push mower—a quart would be more cost-effective.