O’Reilly Synthetic Motor Oil provides high-quality engine protection under all driving conditions and is specifically formulated to provide extra protection against the harmful effects of city driving, where cars undergo higher stress due to constant stopping and going.
O’Reilly Synthetic Motor Oil’s low friction formula helps improve gas mileage for long engine life helps protect against rust, corrosion, startup wear, and varnish build-up, and eliminates the need for extra oil additives. It also protects against thermal breakdown which helps prevent stuck rings.

• Protects engines under all driving conditions
• Lowers friction and improves gas mileage
• Provides longer engine life
• Protects against rust, corrosion, and varnish
• Resists thermal break-down

SYN5-20 – Full Synthetic Motor Oil; 5W-20; 1 Quart
SYN5-20-55 – Full Synthetic Motor Oil; 5W-20; 55 Gallon
SYN5-20-5QT – Full Synthetic Motor Oil; 5W-20; 5 Quart
SYN5-20-6G – Full Synthetic Motor Oil; 5W-20; 6 Gallon