Mobil 1 High Mileage Full Synthetic Motor Oil 5W-30, 5 Quart

What It Is

Mobil 1 High Mileage Full Synthetic Motor Oil 5W-30 is a premium engine oil formulated for lawn mower engines with over 75,000 miles (or equivalent hours) to reduce leaks, oil consumption, and sludge buildup. It’s designed for four-stroke walk-behind mowers, riding mowers, zero-turn mowers, and tractors that specify 5W-30 viscosity.

Fitment & Compatibility

Before buying, check your mower’s owner manual for the recommended oil viscosity (5W-30) and capacity (typically 18–20 oz for small engines, 1–2 quarts for larger). This oil is not for two-stroke engines (requires mixed fuel). Compatible with most Briggs & Stratton, Kohler, Kawasaki, and Honda four-stroke engines that use 5W-30. For older engines (10+ years) or those with high hours/seal wear, this high-mileage formula is ideal. Ensure your mower’s oil drain plug and fill cap are accessible—no special adapter needed.

Key Things to Know

• Seal conditioner: Contains additives that swell aged seals, helping reduce minor oil leaks common in older mower engines.
• Installation: Simple DIY job—drain old oil (warm engine), replace filter if applicable, refill to full mark. No special tools required.
• 5-quart jug: Way more than a single mower needs; store tightly sealed in a cool, dry place. Use within 2 years.
• Not for new engines: High-mileage formula is unnecessary for engines under 75 hours or new mowers—standard 5W-30 is fine.

Should You Buy It

Buy this if you own a four-stroke mower with 5W-30 spec that’s older or has high hours, especially if it’s showing minor oil leaks or burning oil. The seal conditioners and improved high-mileage protection make it a smart, cost-effective choice for extending engine life. Skip it for new or low-hour mowers.