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

What It Is

Mobil 1 Extended Performance High Mileage 5W-30 is a full synthetic motor oil formulated for lawn mower engines with over 75,000 miles (or equivalent hours)—typically used in walk-behind mowers, riding mowers, and zero-turn mowers with 4-stroke engines. It’s designed to reduce oil consumption, sludge buildup, and wear in older or high-hour engines.

Fitment & Compatibility

Before buying, verify your mower engine requires 5W-30 viscosity (check owner’s manual or oil cap). This oil works with most Briggs & Stratton, Kohler, Kawasaki, Honda, and Toro engines, but only for 4-stroke models—do not use in 2-stroke engines. No deck size or brand-specific fitment; it’s universal for gasoline engines that spec 5W-30. Measure your oil capacity: most push mowers take ~20 oz (0.6 qt), riders ~1.5–2 qt. The 5-quart jug covers multiple changes—store tightly sealed in a cool, dry place.

Key Things to Know

• Installation difficulty: Easy. Drain old oil (warm engine), replace filter if equipped, fill to dipstick mark. No special tools needed.
• Quality: Full synthetic with high-mileage additives (seal conditioners, detergents) that extend engine life and reduce leaks in older seals.
• Common gotchas: Do not mix with conventional oil; drain completely first. Overfilling can cause foaming and engine damage. Check oil level on level ground. This oil exceeds API SN and ILSAC GF-5 standards—fine for most small engines but verify your engine’s spec (some older models may prefer SAE 30).
• Storage: 5-quart size is economical but heavy; pour carefully to avoid spills.

Should You Buy It

Buy this if you have a high-hour or older 4-stroke mower (push, rider, or zero-turn) that specifies 5W-30 and you want maximum protection against wear, leaks, and sludge. It’s overkill for a new or low-hour engine—standard 5W-30 synthetic is fine—but the extended-life formula pays off for mowers you plan to keep running for years.