Mobil Full Synthetic Motor Oil 5W-30, 1 Quart (6-pack)

What It Is

This is a 6-pack of Mobil 1 5W-30 full synthetic motor oil, designed for four-stroke lawn mower engines that require a high-quality, low-viscosity oil for year-round performance and cold-start protection.

Fitment & Compatibility

• Engine type: Only for four-stroke (4-cycle) engines. Do not use in two-stroke or mixed-fuel mowers.
• Viscosity: 5W-30 is ideal for push mowers, riding mowers, and zero-turn mowers operating in moderate to cold climates (above -20°F). Check your owner’s manual for the recommended SAE grade – some engines specify 10W-30 or SAE 30.
• Capacity: Each quart is 32 oz. Most push mowers take 15–20 oz; riding mowers take 1.5–2 quarts. A 6-pack covers multiple oil changes or a single large-engine service.
• OEM vs. aftermarket: This is a premium aftermarket oil that exceeds API SN/SP and ILSAC GF-6 standards. It is compatible with most OEMs (Honda, Briggs & Stratton, Kawasaki, Kohler, Toro) but always verify if your engine requires a specific viscosity or synthetic blend approval.

Key Things to Know

• Cold starts: 5W-30 flows better than SAE 30 in cold weather, reducing engine wear during startup. Not recommended for sustained high-heat, heavy-duty mowing in summer – consider 10W-30 or SAE 30 if your manual says so.
• Synthetic vs. conventional: Full synthetic resists thermal breakdown longer, but some older engines with high hours may leak past seals. If your mower has over 500 hours, a conventional 5W-30 might be safer.
• Installation: Easy – drain old oil, replace filter (if equipped), and fill to the dipstick mark. No special tools needed.
• Common gotcha: Do not overfill. Mower engines are small; even an extra 2 oz can cause foaming, smoking, or seal damage.

Should You Buy It

Buy this if you want a premium synthetic oil for a four-stroke mower used in cooler climates or stored in an unheated garage, and you value extended drain intervals (up to 100 hours) and reduced cold-start wear. For hot-climate heavy mowing or high-hour engines, consider a 10W-30 or SAE 30 conventional oil instead.