10 Best Motor Oils 2026 in the United States

Mobil 1 Advanced Full Synthetic Motor Oil 5W-20 is a high-quality option designed to offer excellent engine performance and protection. Its synthetic nature helps it perform better under extreme temperatures, maintaining good viscosity whether it is hot (up to 500 degrees F) or cold (down to -30 degrees F). This oil meets the ILSAC GF-6 standards, ensuring it offers low-speed pre-ignition (LSPI) and timing chain wear protection, which are critical for modern engines.

It also improves fuel economy and helps keep your engine clean by preventing deposits and sludge buildup. One of its standout features is its long oil change interval, allowing you to go up to 10,000 miles between changes, which can save time and money in the long run.

Despite its excellent performance and protection qualities, you may need to consider availability and potentially look for similar alternatives within the Mobil 1 range or other brands as this product has been discontinued. Its viscosity of 5W-20 makes it suitable for a broad range of vehicles, including cars and trucks. If you prioritize engine longevity and performance, and can find it in stock, this motor oil is a strong candidate.

Mobil 1 Advanced Fuel Economy Full Synthetic Motor Oil 0W-20 is designed to enhance fuel efficiency with its low-viscosity formulation. Being a full synthetic oil, it offers superior protection and performance compared to conventional oils. One of its standout features is the Triple Action Formula, which ensures excellent engine performance, cleanliness, and protection, helping to extend the life of your engine by preventing the buildup of deposits and sludge. This oil meets the ILSAC GF-6 standards, providing low-speed pre-ignition and timing chain wear protection, which are critical for modern engines.

Another key advantage is the long oil change interval, allowing up to 10,000 miles between changes, which can be convenient for those who prefer less frequent maintenance. This motor oil has received high customer ratings, indicating strong user satisfaction. However, synthetic oils like this can be more expensive upfront compared to conventional oils. Additionally, while the 0W-20 viscosity is great for fuel economy and cold starts, it may not be suitable for all vehicle types, particularly older models that might require a different viscosity.

This product is highly suitable for those looking to improve fuel economy and engine protection in their cars and trucks.

The Shell Rotella T6 Full Synthetic 5W-40 Motor Oil is a high-quality option for diesel engines, offering several notable strengths. As a full synthetic oil, it provides excellent protection against wear, deposits, and oil breakdown, thanks to its Triple Protection Plus technology. The 5W-40 viscosity ensures good performance in various temperatures, making it suitable for different climates and driving conditions. Additionally, the oil's advanced formulation helps enhance fuel economy by about 1.5%, which is beneficial for those looking to save on fuel costs without sacrificing engine protection or durability.

The inclusion of multi-functional dispersant additives ensures the engine stays clean by protecting against soot, dirt, and other contaminants. This oil also resists breakdown by heat, offering continuous protection throughout its service interval. Furthermore, its low-ash formulation helps maintain exhaust after-treatment devices, which is crucial for modern diesel engines with advanced emission controls. The product comes with a robust warranty, valid for up to 15 years or 500,000 miles, underlining the manufacturer's confidence in its durability.

It meets or exceeds various industry and OEM specifications, making it a reliable choice for a wide range of vehicles, including motorcycles, cars, and trucks. However, potential buyers should note that while the oil excels in many areas, its benefits are most pronounced for diesel engines, which may not be as relevant for those with gasoline engines. Additionally, the commitment to using this oil exclusively to avail the warranty might be a drawback for some users who prefer flexibility in their oil choices. The Shell Rotella T6 is a well-rounded, high-performing synthetic oil suited for those needing robust protection and efficiency for their diesel engines.