OILCHANGEDIY

2018 GMC Sierra HD

Maintenance & specsVERIFIED Oct 27, 2026
Engine Oil
0W-20
Full Synthetic
OEM spec · dexos1 Gen 3Buy oil
Capacity
8qt
with filter
7.7 qt without filter
Oil Filter
PF2232
ACDelco (OEM)
OEM spec: dexos1 Gen 3

The 2018 GMC Sierra HD takes 0W-20 Full Synthetic with a total capacity of 8 quarts (filter included). The OEM oil filter is the ACDelco PF2232. 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.

⚑ QUICK DIY TIPS FOR THE 2018 GMC SIERRA HD
  • Torque your drain plug to 24.4 Nm (18 ft-lbs) to avoid leaks or stripped threads.
  • Using the OEM filter (ACDelco PF2232) is recommended for warranty compliance.
  • Always use 0W-20 Full Synthetic as specified by GMC — using the wrong viscosity can void your powertrain warranty.
01

Oil & Filter

OilBuy
Viscosity0W-20
Oil typeFull Synthetic
Capacity (with filter)8 qt
Capacity (w/o filter)7.7 qt
OEM specdexos1 Gen 3
Filter Options
ACDelcoPF2232OEM
Buy
OEM oil filter for 6.6L Duramax diesel
Drain Bolt & Hardware
Torque spec24.4 Nm
Use new crush washer
02

Fluid Specifications

Transmission FluidBuy
TypeDexron VI
Capacity5.5 qt
Change interval50,000 mi
Brake FluidBuy
DOT typeDOT 3
Change interval45,000 mi
CoolantBuy
TypeDex-Cool
ColorOrange
Capacity9 qt
Change interval120,000 mi
Power Steering FluidBuy
TypeGM Power Steering Fluid
Differential Fluid (rear)Buy
Type75W-90 GL-5
Capacity2.5 qt
Change interval60,000 mi
03

Parts & Specifications

Spark Plugs
TypeIridium
Gap0.040
Quantity4
Change interval100,000 mi
GM12680072OEM
Buy
Tires
Size265/70R17
Front pressure35 PSI
Rear pressure35 PSI
Air Filter
GM84981755OEM
Buy
GM23349854OEM
Buy
GM84850016OEM
Buy
Cabin Air Filter
GM85039741OEM
Buy
GM84977005OEM
Buy
Brake Pads
GM84263246OEMfront
Buy
GM87827067OEMfront
Buy
GM87827068OEMrear
Buy
GM87827069OEMrear
Buy
Wiper Blades
GM84992571passenger
Buy
GM84992571R
Buy
05

Torque Specifications

lug nut
120ft-lb·162.7Nm
spark plug
14mm thread, aluminum head
18ft-lb·24.4Nm
06

Safety Recalls

6
07

Technical Service Bulletins

1027
Save by doing it yourself
A shop typically charges $70–$160 for this service. Buy the parts and save.
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08

Tools & Supplies

Oil Drain Pan
Catch the old oil cleanly
Shop on Amazon
Funnel
Spill-free refill
Shop on Amazon
Socket Wrench
For the drain plug
Shop on Amazon
0W-20 Oil
8+ quarts
Shop on Amazon
Shop parts for the GMC Sierra HD
Find oil, filters, and maintenance parts for the 2018 GMC Sierra HD on Amazon.
Shop parts ↗
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
Other 2018 GMC models
Other GMC Sierra HD years
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