Complete Oil Specifications
Your 2023 Chevrolet Silverado 2500HD 6.6L gas V8 requires full synthetic 5W-30 motor oil meeting GM’s dexos1 Gen 3 specification.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 5W-30 |
| API Rating | SP |
| ILSAC Rating | GF-6A |
| Capacity (with filter) | 8.5 quarts |
| Oil Filter | ACDelco PF63 |
| Normal Interval | 7500 miles |
Why 5W-30 is Critical for This Engine
The naturally aspirated 6.6L L8T gas V8 is practically built specifically for grueling jobs under maximum payload limits. Rather than optimizing blindly for fuel economy by defaulting to ultra-thin oils, GM engineers mandated 5W-30 for this workhorse. This slightly higher viscosity limits high-temperature sheer when fighting steep grades or heavy trailers for hours on end, keeping metal separation reliable.
Using incorrect oil will:
- ❌ Provide inadequate film strength during continuous high-RPM, high-load pulling
- ❌ Risk valvetrain and lifter wear if using unapproved non-dexos1 oils
- ❌ Likely void your GM heavy-duty powertrain warranty
Chevrolet-Approved Oil Brands
-
✅ Mobil 1 Advanced Full Synthetic 5W-30
-
✅ Valvoline Advanced Full Synthetic 5W-30
-
✅ Pennzoil Platinum Full Synthetic 5W-30
-
✅ Castrol EDGE 5W-30 Advanced Full Synthetic
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✅ ACDelco dexos1 Gen 3 Full Synthetic 5W-30
GM requires the use of engine oils approved to the dexos1 Gen 3 specification to protect modern GM engines adequately. Look for the dexos1 logo on the container.
Severe Service Check
You need the 5000-mile interval if you:
- Regularly tow trailers crossing significant payload weight limits
- Haul heavy construction or agricultural equipment
- Operate heavily in commercial stop-and-go settings or fleet environments
- Drive off-road, navigating farm land or extreme dirt conditions
- Idle extensively
Installation Details
Drain Plug Torque: 18 ft-lbs
OEM Filter: ACDelco PF63
Aftermarket Filters:
-
Wix 57045
-
Mobil 1 M1-212A
-
K&N HP-2011
Pro Tip: Heavy Duty 2500HD frames are tall, but accessing the 6.6’s filter still requires a reach from below. Ensure you have an extra-large, sturdy catch pan ready, as 8.5 quarts evacuates very rapidly once the wide drain plug is pulled.
FAQs
What oil does a 2023 Chevrolet Silverado 2500HD 6.6L gas take?
It requires 5W-30 full synthetic motor oil that meets the GM dexos1 Gen 3 specification.
How many quarts does it need?
You will need 8.5 quarts when you change the filter. Using just 8 will leave you dangerously low on the heavy-duty engine’s dipstick.
Can I use the generic 0W-20 used across normal Silverados?
No. The light-duty 5.3L uses 0W-20, but the heavy-duty L8T 6.6L must use 5W-30 to manage its significantly higher workload and load-bearing pressures.
How often should I change the oil?
Monitor the GM Oil Life system, but do not exceed 7500 miles, 12 months, or the time interval prompted. Severe commercial towing can safely cut this down near 5000 miles.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-03-17 | Source: 2023 Chevrolet Silverado 2500HD Owner’s Manual