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Dexos 1 Gen 2 vs. Gen 3: A Detailed Comparison

Dexos 1 Gen 2 and Dexos 1 Gen 3 are both oil specifications developed by General Motors (GM). They are both designed to provide excellent protection for GM engines, but there are some key differences between the two specifications.

Dexos 1 Gen 2 was introduced in 2015 and was designed to meet the needs of GM’s gasoline engines. It is a high-quality oil made with high-quality base oils and additives. Dexos 1 Gen 2 is available in various viscosities to meet the needs of different vehicles.

Dexos 1 Gen 3 was introduced in 2020 and was designed to meet the needs of GM’s gasoline and diesel engines. It is a more advanced oil than Dexos 1 Gen 2 and has improved oxidation resistance, deposit control properties, and low-speed pre-ignition (LSPI) prevention capabilities. Dexos 1 Gen 3 is also available in a wider range of viscosities than Dexos 1 Gen 2.

So, which one is better? Dexos 1 Gen 3 is better if you have a GM gasoline or diesel engine made after 2020. It offers improved engine protection and can help improve fuel economy.

Here is a table that summarizes the key differences between Dexos 1 Gen 2 and Dexos 1 Gen 3:

FeatureDexos 1 Gen 2Dexos 1 Gen 3
Designed forGasoline enginesGasoline and diesel engines
Oxidation resistanceGoodImproved
Deposit control propertiesGoodImproved
LSPI prevention capabilitiesNot availableAvailable
Viscosity rangeWideWider

Ultimately, the best way to decide which oil is right for you is to consult your car’s owner’s manual. The owner’s manual will specify the type of oil recommended for your car.

Understanding the Genesis: Dexos 1 Gen 2

The journey of Dexos 1 began with the Gen 2, which was formulated to surpass the performance requirements of conventional engine oils. Let’s delve deeper into its specifics.

  • Protection Against LSPI: Low-Speed Pre-Ignition (LSPI) is a significant concern in modern turbocharged engines. Dexos 1 Gen 2 was explicitly designed to reduce the probability of LSPI, ensuring a longer engine life.
  • Improved Oxidation Stability: With enhanced thermal and oxidative stability, this generation guarantees that the oil remains functional even under extreme conditions, thus maintaining engine health.
  • Enhanced Fuel Efficiency: Thanks to its superior formulation, Gen 2 provides optimal fuel efficiency, which is paramount in today’s economy.

The Evolution: Dexos 1 Gen 3

Progressing from Gen 2, Dexos 1 Gen 3 carries the legacy forward, with some remarkable upgrades. Let’s elucidate its outstanding features.

  • Superior Wear Protection: Gen 3 promises unparalleled wear protection, ensuring the engine components remain shielded even under taxing conditions.
  • Advanced Deposit Control: This generation excels in keeping the engine clean. It efficiently keeps sludge and other harmful deposits at bay, thus enhancing engine longevity.
  • Optimized Viscosity Range: The viscosity of Gen 3 is perfectly tailored to support engines across different conditions, leading to smoother operations and reduced wear and tear.

Which One Should You Opt For?

Your choice between Dexos 1 Gen 2 and Dexos 1 Gen 3 will depend on your vehicle’s specific needs and personal preferences. If you are looking for a reliable and tried-and-tested solution, Gen 2 will serve you well. However, if you’re leaning towards the latest technological advancements with slightly enhanced features, Gen 3 is the way to go.


Both Dexos 1 Gen 2 and Dexos 1 Gen 3 stand as testimonies to engineering excellence. They signify advancements in engine oil technology, catering to the diverse requirements of modern engines. By understanding their unique features and benefits, you can make an informed choice that best suits your automotive needs.