Complete Oil Specifications
Your 2023 Cadillac CT5 with the 2.0T LSY engine requires 0W-20 full synthetic oil meeting GM dexos1 Gen3 and API SP / ILSAC GF-6A. The LSY is GM’s turbocharged four-cylinder, shared across multiple Cadillac, Buick, and Chevrolet vehicles, and features continuous variable valve timing (CVVT) and high-pressure direct injection.
dexos1 Gen3 Required: GM mandated dexos1 Gen3 (replacing Gen2) for all 2022+ turbocharged models. dexos1 Gen3 adds enhanced Low-Speed Pre-Ignition (LSPI) protection critical for the LSY’s direct injection and stop/start system. Using Gen2 or non-dexos oils voids the GM powertrain warranty.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-20 |
| API Rating | API SP, GM dexos1 Gen3 |
| ILSAC Rating | GF-6A |
| Capacity (with filter) | 5.3 quarts |
| Oil Filter | AC Delco UPF63R |
| Normal Interval | 7500 miles |
Why dexos1 Gen3 Is Non-Negotiable for the LSY
The LSY engine’s Gasoline Direct Injection (GDI) system creates conditions where fuel droplets can condense on cylinder walls and dilute the oil — a particular concern with turbocharged direct-injection engines in stop-and-go driving. dexos1 Gen3’s formulation specifically addresses fuel dilution resistance and LSPI events, which occur when fuel-diluted oil ignites before the spark plug fires, causing a damaging pressure spike. Gen3 also improves oxidation stability for GM’s auto stop/start system, which cycles the engine repeatedly in traffic.
Using incorrect oil will:
- ❌ Increase LSPI risk — potentially causing catastrophic connecting rod failure
- ❌ Void GM powertrain warranty (dexos1 approval is a warranty condition)
- ❌ Accelerate oxidation from the engine’s stop/start cycling in traffic
Cadillac-Approved Oil Brands
-
✅ ACDelco dexos1 Gen3 Full Synthetic 0W-20
-
✅ Mobil 1 dexos1 Gen3 Full Synthetic 0W-20
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✅ Pennzoil Platinum dexos1 Gen3 Full Synthetic 0W-20
-
✅ Castrol Edge with Titanium dexos1 Gen3 0W-20
-
✅ Valvoline Modern Engine Full Synthetic dexos1 0W-20
Look for the dexos1 Gen3 approval on the bottle. Note that dexos1 Gen2-only oils are not approved for the 2023 CT5 even if the viscosity matches.
Severe Service Check
Use the 3750-mile interval if you:
- Drive primarily in urban stop-and-go traffic (increases fuel dilution risk)
- Make frequent short trips under 5 miles
- Operate in extreme temperatures below 0°F
- Use Sport or Track mode regularly
Installation Details
Drain Plug Torque: 18 ft-lbs
OEM Filter: AC Delco UPF63R
Aftermarket Filters:
-
Mobil 1 M1-113A
-
WIX 57502
-
K&N HP-1017
Pro Tip: The LSY’s oil filter is a canister-style unit on the side of the engine block. The GM Oil Life System will calculate when to change based on your actual driving — don’t override it by changing at arbitrary intervals, but don’t go beyond 7,500 miles regardless.
FAQs
What oil does a 2023 Cadillac CT5 2.0T take?
0W-20 full synthetic with GM dexos1 Gen3 approval. API SP / ILSAC GF-6A.
How many quarts does the CT5 2.0T need?
5.3 quarts with a new filter, 5.0 without.
What’s the difference between dexos1 Gen2 and Gen3?
Gen3 (introduced for 2022+ models) adds enhanced LSPI protection and improved fuel dilution resistance — both critical for the LSY’s GDI and stop/start operation. Do not use Gen2 in the 2023 CT5.
Is synthetic oil required?
Yes. dexos1 Gen3 requires full synthetic. Conventional or synthetic-blend oils cannot meet the dexos1 standard.
How often should I change the oil?
Every 7500 miles at most. The GM Oil Life System may prompt earlier in severe conditions.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-04-12 | Source: 2023 Cadillac CT5 Owner’s Manual