Oil
- Viscosity
- 0W-20
- Oil type
- Full Synthetic
- Capacity (with filter)
- 8 qt
- Capacity (without filter)
- 7.7 qt
OEM notes: dexos1 Gen 3
2021 GMC Sierra HD Maintenance & Specs
Everything you need to maintain your 2021 GMC Sierra HD — oil specs, maintenance schedule, recalls, and more.
The 2021 GMC Sierra HD takes 0W-20 Full Synthetic with a total capacity of 8 quarts (filter included). The OEM oil filter is the ACDelco PF63E, with 5 compatible alternatives listed below. Note: this vehicle has 6 active recalls — check the recalls section below. Below you’ll find complete maintenance specs, fluid capacities, parts, and links to buy what you need.
Data last verified: May 12, 2026
OEM spec: dexos1 Gen 3
Quick DIY Tips for the 2021 GMC Sierra HD
- Using the OEM filter (ACDelco PF63E) is recommended for warranty compliance.
- Always use 0W-20 Full Synthetic as specified by GMC — using the wrong viscosity can void your powertrain warranty.
Filter options
- ACDelco PF63EOEMBuy →
OEM oil filter for 6.6L L8T V8 (gas)
- Wix 51061Buy →
Aftermarket cross for ACDelco PF63E
- Fram PH7575Buy →
Aftermarket cross for ACDelco PF63E
- ACDelco PF2232OEMBuy →
OEM oil filter for 6.6L Duramax diesel
- Donaldson P551313Buy →
Aftermarket cross for Duramax
- Fleetguard LF14000NNBuy →
Aftermarket cross for Duramax
Drain bolt & hardware
Drain bolt specs not yet added.
Safety recalls6
Technical Service Bulletins732
Shop Parts for the GMC Sierra HD
Find oil, filters, and maintenance parts for the 2021 GMC Sierra HD on Amazon.
Tools & supplies
Step-by-step guide
Detailed walkthrough with tips for first-timers.
Read guide →How often to change oil
Intervals, severe service, and what your car needs.
Read guide →Synthetic vs. conventional
Which oil type is right for your engine and budget.
Read guide →Have info for this vehicle?
Help fellow owners — submit specs from your owner's manual.
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