Maximize engine life and fuel efficiency with wholesale deals on premium motor oil at Costco. Protect your daily commuter, fleet truck, or heavy-duty diesel engine against extreme heat, friction, and sludge buildup with bulk savings on advanced full synthetic motor oil from trusted brands like Mobil 1 and Kirkland Signature.

• 0W-20: Low-viscosity formula for maximum fuel economy, hybrid efficiency, and instant cold-weather starts.
• 5W-20: Reliable daily wear and sludge protection for passenger vehicles and high-efficiency engines.
• 5W-30: Versatile viscosity delivers high-temp film strength for turbocharged, high-mileage, and severe-duty drives.