Harbor Freight Tools


32 oz. Four-Cycle Oil SAE 10W-30

STP® Premium Small Engine 4-Cycle Oil SAE 10W-30 specially formulated for use in generators and outdoor power equipment

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Product Overview

STP® Premium Small Engine 4-Cycle Oil SAE 10W-30 is specially formulated for use in generators and outdoor power equipment. Its synthetic blend formula is scenically engineered with antioxidants, anti-wear technology, a viscosity index improver, detergents and a corrosion inhibitor to help maintain maximum performance in 4-cycle small engines. Its synthetic blend formula helps extend the drain interval, reduce oil thickening and oxidation, and promotes easier starts all year. Can be used with generators, riding mowers, pressure washers, gas powered pumps, compacters, chipper shredders and other 4-cycle gasoline powered small engines (refer to owner’s manual). Meets API category SJ specifications.

  • Engineered with Anti-Wear Technology that provides engine part lubrication and reduced engine wear
  • All-weather synthetic blend formula promotes easier starts all year
  • Antioxidants fight thermal breakdown to enhance oil durability
  • Viscosity index improver helps reduce oil consumption
  • Detergents help keep engine components clean and control carbon deposits
  • Corrosion inhibitor promotes equipment longevity during seasonal storage

Important Information

  • STP® is a registered trademark of the Armor All/STP Products Company


4-cycle gasoline powered small engines
Container size
32 oz.
Shipping Weight
2.20 lb.
Note: Specifications are approximate and subject to change


100% Satisfaction Guarantee! If for ANY reason you are not satisfied with this item, you may return it within 90 days for a full refund or replacement.

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