Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 GMC SierraOil Type & Capacity
OEM spec from the factory service manual for the Base, 2D Pickup, 4.3L Eng VIN H, 4WD variant.
Quick Answer
Oil Type
API - SAE 5W-30
Capacity (w/ Filter)
6.00 QTS.
5.67 L
Variant
Base, 2D Pickup, 4.3L Eng VIN H, 4WD
Note: Use only engine oil licensed to the dexos1 specification, or equivalent.
ACDelco dexos1 Synthetic Blend is recommended.
Failure to use the recommended engine oil or equivalent can result in engine damage not covered by the vehicle warranty. Check to be sure the oil is approved to the dexos1 specification.
For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures.
DO NOT use other viscosity grade oils such as SAE 10W-30, 10W-40, or 10W-50.
Source: Factory service manual — 2018 GMC Sierra Base, 2D Pickup, 4.3L Eng VIN H, 4WD. View full manual section →
What You'll Need
Frequently Asked Questions
- What type of oil does a 2018 GMC Sierra take?
- The 2018 GMC Sierra requires API - SAE 5W-30. The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Base, 2D Pickup, 4.3L Eng VIN H, 4WD configuration.
- How much oil does a 2018 GMC Sierra need?
- The 2018 GMC Sierra takes 6.00 QTS. (5.67 L) of engine oil with the filter replaced.
- Can I use synthetic oil in my 2018 GMC Sierra?
- Yes — synthetic oil that meets the API - SAE 5W-30 specification is acceptable and often preferred for better protection and longer change intervals.
- What happens if I use the wrong oil in my 2018 GMC Sierra?
- Using oil that does not meet the API - SAE 5W-30 specification can reduce engine protection, increase wear, and potentially void warranty coverage. Always use oil that meets the OEM spec.