Opti-4 43024 Single SAE 30 20 Ounce 4-Cycle Engine Lubricant

What It Is

The Opti-4 43024 is a 20-ounce bottle of single-viscosity SAE 30 4-cycle engine lubricant, designed for small engines in lawn mowers, tractors, and other outdoor power equipment that call for straight-weight oil.

Fitment & Compatibility

• Check your engine manual – SAE 30 is for warmer temperatures (above 40°F). Do not use in engines requiring multi-viscosity (e.g., SAE 10W-30) or synthetic blends unless specified.
• Brand/Model – Works with any 4-cycle engine from Briggs & Stratton, Honda, Kohler, Kawasaki, Tecumseh, and others that specify SAE 30. Not for 2-cycle engines.
• OEM vs Aftermarket – This is an aftermarket oil. It meets API service classification SJ and higher, which covers most current small engines.
• Measurements – 20 oz bottle. Some mowers take 18–20 oz; check your dipstick or fill cap for exact capacity. For larger engines (e.g., 1+ quart sump), you may need two bottles.

Key Things to Know

• Single viscosity only – SAE 30 is thick when cold. Not recommended for winter use or in cold climates.
• No additives needed – Formulated for 4-cycle small engines; do not mix with fuel or add stabilizers unless the bottle says so.
• Easy to pour – Bottle has a built-in spout and is pre-measured for many standard walk-behind mowers.
• Check your oil level – After filling, run the engine briefly, then recheck. Overfilling can cause leaks or smoke.

Should You Buy It

If your mower or small engine specifies straight SAE 30 and you want a simple, pre-measured bottle for a single fill, this is a solid choice. It’s best for warm-weather mowing and for users who prefer conventional oil over synthetic blends. Skip it if you need multi-viscosity, cold-weather protection, or a larger volume.