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Motor Oil: Synthetic Motor Oil Dexos1 | ACDelco

ACDelco dexos1® Synthetic Blend Motor Oil is specifically designed for GM vehicles. Engineered to improve engine cleanliness, engine performance and fuel efficiency, ACDelco dexos1® Synthetic Blend Motor Oils are composed of high-quality synthetic base stocks and exceptional additive technology. Appropriate for use in most domestic and foreign vehicles, ACDelco dexos1® Synthetic Blend Motor Oil is the General Motors factory fill and the required service fill for GM vehicles with gasoline engines beginning with the 2011 model year. Recommended for use in cars and light trucks with gasoline and gasoline turbocharged engines where API SN and all prior specifications are required.


  • Meets the highest U.S. standards for automotive engine wear protection to provide top-of-the-line engine support.
  • Meets ILSAC GF-5 specifications to fulfill current energy-conserving performance standards.
  • Meets API SN Service Classification requirements to be suitable for use in modern engines.
  • Provides protection against high-temperature deposits to reduce engine wear.
  • Provides protection against viscosity breakdown for long oil life and drain intervals.
  • Protects against the formation of sludge and varnish deposits on engine parts to provide additional engine support even in demanding stop-and-go driving conditions.
  • Meets the highest U.S. standards for automotive engine wear protection to provide exceptional engine support.
  • Meets dexos1® specifications, resulting in high resistance to oxidation, excellent low-temperature flow and pumpability during early-morning cold start-ups and excellent protection against formation of sludge and other harmful deposits
  • 5W-20 Part No.10-9122
    5W-30 Part No. 10-9050

Signs of Wear & Troubleshooting:

An oil change for your vehicle might be necessary:

  • If your vehicle’s oil level is low.
  • If there are unusual noises from under the hood.
  • If your vehicle’s oil is very dark or thick.
  • If the Oil Life Monitoring System in your vehicle is approaching 0 percent, or if you have driven more than the recommended miles in your Owner’s Manual.



  • Black fluid leaking from the vehicle could be a motor oil leak.
  • A heavy thick smell originating from under the hood or from the exhaust could be a sign of burning oil within the vehicle.

Good Maintenance Practices:

  • Your motor oil must be changed regularly.
  • Replacing dirty oil and filters will help protect the inside of your engine from premature wear.
  • Use the recommended grade of oil for your vehicle as found in your Owner’s Manual.
  • Follow either your vehicle’s Oil Life Monitoring System or your vehicle Owner’s Manual recommended oil change intervals.
  • Check your dipstick at every fuel fill for oil levels and color. For the most accurate reading, wait a few minutes after turning off the engine to give the oil time to drain from the crankcase into the oil pan.


Should I flush my engine before switching from conventional to synthetic or vice versa?

  • No, it is not necessary to flush your engine when switching between conventional and synthetic motor oils.


Is it true that new engines need break-in periods using conventional motor oil?

  • No, it is not true that new engines need a break-in period using conventional motor oil. New engines can be run with conventional or synthetic motor oils while still properly breaking in the engine components.


Can synthetic and conventional oils be used together?

  • Yes, the two can be mixed and still retain proper baseline functionality without causing any harm to your vehicles engine. However, this is not advisable, as mixing conventional with synthetic oils lessens the performance properties of the latter.


Do I need a special oil filter for a synthetic oil? Or will a regular filter do?

  • No, you do not need to use a special filter for synthetic motor oil. The type of oil filter used isn’t necessarily based on the type of oil, but rather on vehicle specifications. Always use the quality of filter that meets the specifications denoted in your owner’s manual.


Does my vehicle require a specific amount of motor oil?

  • Yes and your vehicles Owner’s Manual will contain information containing to the oil specification and capacity for your engine.


Is there a way to tell if my motor oil needs to be changed or is running low?

  • Yes. If equipped, your vehicle’s Oil Life Monitoring System will inform you when your motor oil needs to be changed, or, as a minimum, once every year. 
  • If your vehicle does not have an Oil Life Monitoring System, change the oil per Owner's Manual guidelines. Periodically check your vehicle’s motor oil dipstick for your oil levels. For more information regarding vehicle specific oil life and appropriate oil levels, check your vehicle Owner’s Manual.


Will using synthetic motor oil extend the change period as shown by the oil life monitor?

  • No, the oil life monitor is not impacted by the type of oil used, it is only influenced by the amount and type of driving. 
  • Synthetic oil will, however, improve the protection provided to the engine by the lubricant.


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