GMC Sierra 4WD AT4 Engine Oil Specs
Engine oil type, capacity & service interval for the GMC Sierra 4WD AT4 (2020–2021). Select your year below for full specifications.
Select Year – GMC Sierra 4WD AT4 Engine Oil
2 years foundGMC Sierra 4WD AT4 Engine Oil Specs by Year
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The GMC Sierra 4WD AT4 was produced from 2020 to 2021. This model typically uses 5W-30 full synthetic engine oil — a specification common to most GMC Sie-series vehicles.
Selecting the correct oil viscosity for your GMC Sierra 4WD AT4 is essential. Using a grade that is too thin reduces protection at operating temperature, while too thick an oil impairs cold-start flow and reduces fuel economy. Always match the exact grade shown for your specific model year.
The recommended oil change interval for the GMC Sierra 4WD AT4 is every 10,000 miles or 12 months. Under severe driving conditions — track use, towing, or frequent cold starts — shorten this interval by 25–30%.
When servicing your GMC Sierra 4WD AT4, always replace the oil filter at every oil change. Using a quality filter — such as the Mann or Mahle filters specified for GMC engines — ensures proper oil pressure and prevents unfiltered oil from circulating through the engine.
Oil change costs for the GMC Sierra 4WD AT4 at a US dealership or independent European specialist typically range from $120 to $200 for a full synthetic service. DIY oil changes cost approximately $60–$90 in parts (oil + filter) and take about 30 minutes with the right tools.
Always consult your vehicle's owner's manual to confirm the exact specification for your specific trim and engine variant, as some GMC Sierra 4WD AT4 configurations may have different requirements.
GMC engines require BMW Longlife-approved full synthetic oil. Using non-approved conventional oil can damage the variable valve timing (VANOS) system and void your warranty.
GMC engines may consume small amounts of oil between services. Check the oil level via the iDrive display or dipstick every 1,000 miles to avoid running low, especially in older models.