Complete Oil Specifications
Your 2023 Cadillac CT5-V Blackwing’s 6.2L LT4 supercharged V8 requires 0W-40 full synthetic oil meeting the GM DexosR high-performance specification. DexosR is a distinct and more demanding standard than standard Dexos Gen3 — it was specifically created for GM’s high-output supercharged V8 applications and mandates higher shear stability, oxidation resistance, and thermal durability than the base Dexos specification.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-40 |
| API Rating | GM DexosR (High-Performance) |
| ILSAC Rating | GM DexosR |
| Capacity (with filter) | 10.0 quarts |
| Oil Filter | GM 12677836 |
| Normal Interval | 7500 miles |
Why 0W-40 DexosR is Critical for This Engine
The LT4’s 1.7L Roots-type supercharger spins off the crankshaft and operates from cold start, instantly generating heat and pressure that exceed what normally-aspirated or even turbocharged engines produce. DexosR’s shear stability requirements ensure the oil maintains its viscosity grade under sustained supercharger-load conditions where weaker oils shear thin. The 10-quart capacity provides a thermal buffer critical at track speeds; overfilling or underfilling by even 0.5 qt measurably affects oil temperature at the crankcase.
Using incorrect oil will:
- ❌ Allow viscosity shear-down under sustained supercharger operation, reducing film strength
- ❌ Risk bearing damage from oil that falls outside the LT4’s design pressure requirements
- ❌ Void GM Performance warranty coverage for the powertrain on a 668 hp vehicle
Cadillac-Approved Oil Brands
-
✅ Mobil 1 0W-40 Motor Oil (DexosR approved)
-
✅ Castrol EDGE 0W-40 A3/B4 (DexosR approved)
-
✅ Pennzoil Platinum Euro Full Synthetic 0W-40
-
✅ Liqui-Moly Synthoil Race Tech GT1 0W-40
-
✅ Shell Helix Ultra Racing 0W-40
Confirm DexosR (not Dexos1, Dexos2, or Gen3) appears on the container. GM licenses DexosR independently from the standard Dexos program — verify using GM’s official DexosR approval database before purchasing.
Severe Service Check
You need the 3000-mile interval if you:
- Attend track days, circuit driving events, or HPDE sessions
- Use Performance Traction Management (PTM) modes regularly
- Make repeated wide-open-throttle acceleration runs
- Drive in sustained high ambient temperatures (above 90°F) with aggressive use
Installation Details
Drain Plug Torque: 18 ft-lbs
The LT4 uses a composite oil pan — do not exceed 18 ft-lbs. Replace the drain plug O-ring at every oil change; the O-ring style seal is more reliable than a crush washer but must be replaced to prevent slow seepage.
OEM Filter: GM 12677836
Aftermarket Filters:
-
Mobil 1 M1-114A
-
K&N HP-3001
-
Fram XG3387A
Pro Tip: The CT5-V Blackwing’s GM OLM will suggest intervals up to 7,500 miles under gentle driving. For any track use, manually reset to a 3,000-mile interval — the OLM is calibrated for street driving and underestimates oil stress on a supercharged V8 at sustained high RPM.
FAQs
What oil does a 2023 Cadillac CT5-V Blackwing take? 0W-40 full synthetic oil meeting the GM DexosR high-performance specification.
How many quarts does it need? 10.0 quarts with a new filter, 9.5 without.
Can I use standard Dexos Gen3 instead of DexosR? No — Dexos Gen3 is a different, less demanding standard. The LT4 explicitly requires DexosR, which has higher shear stability and thermal requirements specific to supercharged V8 applications.
Is full synthetic required? Yes — GM DexosR is a full-synthetic-only specification. No conventional or blend oils carry this approval.
How often should I change the oil for track use? Every 3000 miles or after every track event, whichever comes first. The OLM is not calibrated for sustained high-RPM supercharged operation.
Why does it take 10 quarts? The LT4’s high-volume dry-sump-inspired oiling system uses a large crankcase capacity as a thermal reservoir to manage oil temperature under sustained performance driving. Do not overfill — the level at the full mark is exact.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-06-06 | Source: 2023 Cadillac CT5-V Blackwing Owner’s Manual (84789956 A)