DEWALT Biosynthetic SAE 10W-30 Oil – 4-Cycle Engine Oil for Small Engines, Generators & Outdoor Power Equipment – Meets and Exceeds API SP – Extended Interval, Cold Start Protection – 18 oz

What It Is

This is a synthetic SAE 10W-30 engine oil formulated for 4-cycle small engines, including lawn mowers, generators, pressure washers, and other outdoor power equipment. It meets the latest API SP standard for extended oil change intervals and improved cold-start protection.

Fitment & Compatibility

• Engine type: Only for 4-cycle engines (not for 2-cycle or mixed-fuel engines).
• Viscosity: SAE 10W-30 – suitable for most residential mowers, generators, and small engines operating in temperatures from -20°F to 100°F.
• Capacity: 18 oz bottle – check your equipment’s oil capacity (typically 15–20 oz for walk-behind mowers; may need two bottles for larger engines).
• OEM vs aftermarket: Works as a direct replacement for any SAE 10W-30 oil; no special adapters needed. Dewalt-branded but compatible with all major brands (Honda, Briggs & Stratton, Kohler, etc.).
• Check before buying: Confirm your engine requires SAE 10W-30 (not 5W-30 or straight 30 weight). Verify oil capacity – if over 18 oz, buy two bottles. For zero-turn or riding mowers, check manual for sump size.

Key Things to Know

• Synthetic vs conventional: Offers longer life and better cold-weather flow than conventional 10W-30, but still follow your engine’s recommended change interval (typically 50–100 hours).
• Installation difficulty: Easy – just drain old oil, replace filter if equipped, and pour in. No special tools required.
• Common gotcha: This is a single 18 oz bottle. Many larger engines (e.g., 500–700 cc generators or riding mowers) need 24–32 oz, so you may need a second bottle.
• API SP rating: Provides extra protection against low-speed pre-ignition (LSPI) and turbocharged engines – overkill for most lawn mowers but still fully compatible.

Should You Buy It

If you want a high-quality synthetic oil that offers better cold-start protection and longer intervals than standard conventional oil, and your engine uses SAE 10W-30, this is a solid choice. It’s especially good for seasonal equipment that sits in cold garages or sheds. Skip it if you need a larger quantity (over 18 oz) or a different viscosity.