Opti All 2 Cycle Engine Motor Oil 1.8 oz.

What It Is

Opti All 2 Cycle Engine Motor Oil (1.8 oz.) is a pre-measured, single-use bottle of 2-cycle oil designed for mixing with gasoline in small engines that require a 50:1 fuel-to-oil ratio. It’s intended for use in handheld lawn equipment like string trimmers, leaf blowers, hedge trimmers, and chainsaws—not for riding mowers or 4-cycle engines.

Fitment & Compatibility

• Engine type: Only for 2-cycle (2-stroke) engines. Do not use in 4-cycle engines.
• Fuel ratio: Requires a 50:1 mix (2.6 oz. oil per gallon of gas). This 1.8 oz. bottle is sized for mixing with 1 gallon of fuel—check your equipment’s manual to confirm it uses 50:1, not 40:1 or 32:1.
• Brand/model: Universal for any 2-cycle engine that specifies 50:1 (e.g., Echo, Husqvarna, Stihl, Ryobi, Craftsman). No OEM-specific restrictions.
• Measurement: Bottle is 1.8 oz. If your tank is smaller than 1 gallon, you’ll need to measure partial amounts or use a different product.
• Before buying: Confirm your equipment’s fuel mix ratio (usually printed on the fuel cap or in the manual). If it’s 40:1 or 32:1, this oil will under-lubricate the engine.

Key Things to Know

• Quality: Opti is a budget-friendly aftermarket brand. It meets basic 2-cycle oil standards but may not have the same detergents or stabilizers as premium brands (e.g., Stihl HP Ultra). Fine for occasional use, but not ideal for high-performance or daily-use equipment.
• Installation difficulty: Trivial—just pour the entire bottle into 1 gallon of unleaded gasoline and shake well. No tools required.
• Common gotcha: The bottle is single-use and not resealable. If you only need half a gallon, you can’t store the leftover oil. Also, avoid using in engines that require synthetic or low-ash oil (check your manual).
• Storage: Keep in a cool, dry place. Once mixed, use the fuel within 30 days to prevent gumming.

Should You Buy It

Buy this if you have a single small 2-cycle tool that uses a 50:1 mix and you want a cheap, no-fuss way to handle a single gallon of fuel without measuring. Skip it if your equipment requires a different ratio, if you need synthetic oil for a high-end engine, or if you want a larger bottle for multiple fills.