10 Best Synthetic Oil For Small Engines of August 2025

• 100% Synthetic SAE 5W-30
• For Use In All Air Cooled 4-cycle Engines
• 32 Oz. bottle

Briggs & Stratton

• Dramatically reduce engine wear
• Leave critical engine parts 4X smoother* * As tested in the industry Sequence IVA wear test
• Superior wear protection on critical engine parts
• Meets Specifications: API SN Plus, ILSAC GF-5, GM dexos1 Gen 2, Ford WSS-M2C929-A, WSS-M2C946-B1
• Castrol recommends the use of Bosch oil filters

Castrol

• Better wear protection
• Increased protection against LSPI
• Increased fuel efficiency
• Better protection for vehicle exhaust emissions equipment
• Improved compatibility with fuels containing ethanol
• Superior corrosion protection

Royal Purple

• Innovative anti-wear additives provide 50% more wear protection than industry standards as tested in the industry Sequence IVA wear test
• Full synthetic formula for exceptional high and low temperature protection
• Extra detergents help fight sludge and deposits
• Superior antioxidants resist motor oil breakdown in extreme conditions

Valvoline

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Formulated for longer drain intervals
• Helps prevent build up that can cause rust and corrosion
• Reduces friction for less engine wear
• High resistance to viscosity and thermal breakdown
• Helps reduce exhaust emissions

Amazon Basics

• 4-Quart Package
• Genuine Kohler Synthetic Blend Oil

Kohler

• “The Only One“ endorsed and recommended by Cummins
• Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations
• Outstanding oxidation resistance supports long oil life in heavy duty engines
• Superior wear protection for hardworking heavy-duty trucks and equipment

Valvoline

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Better fuel economy - compared to 15W-40 oils Rotella offers enhanced fuel economy capability of 1. 5% without compromising engine protection or durability
• Improved wear performance - provides a significantly increased level of protection against harmful engine wear when compared to previous generation API CJ-4 engine oils
• Improved deposit control - advanced multi-functional dispersant additives in combination with synthetic base oils provide an enhanced level of protection against the effects of soot, dirt and other contaminants
• Emissions system compatibility - advanced low-ash formulation helps control blocking of or poisoning of exhaust after-treatment devices, helping maintain vehicle emission compliance and engine fuel efficiency
• Improved heat resistance - resists breakdown by heat to provide continuous protection throughout the service interval

Shell Rotella T

• Official Suzuki Product.
• Part Number: 990A0-01E40-01G
• Model Fit: All Suzuki motorcycle, atvs and scooters.
• Contributes to Improved Fuel Efficiency
• Reduced Friction Improved Engine Performance

Suzuki

• -Dramatically reduce engine wear
• -Leave critical engine parts 4X smoother* * As tested in the industry Sequence IVA wear test
• -Superior wear protection on critical engine parts
• -Unsurpassed level of protection against viscosity breakdown
• -Unique full synthetic technology to fight against harmful sludge build-up
• -High level of fuel economy based on US industry standards
• -API SN; ILSAC GF-5; GM dexos1

Castrol