Complete Oil Specifications
Your 2023 Cadillac CT4 2.0L Turbocharged I4 (LSY) requires full synthetic SAE 0W-20 oil meeting GM dexos1 Gen 3 certification and API SP standards.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-20 |
| API Rating | dexos1 Gen 3 |
| ILSAC Rating | GF-6A |
| Capacity (with filter) | 5.3 quarts |
| Oil Filter | ACDelco PF64 |
| Normal Interval | 7500 miles |
Why dexos1 Gen 3 and 0W-20 Are Critical
The CT4’s LSY 2.0L turbocharged four-cylinder uses both port and direct injection (combined PFI + GDI), variable valve timing on both intake and exhaust camshafts, and an integrated turbocharger designed for quick spool. GM’s dexos1 Gen 3 specification — introduced in 2021 — adds mandatory Low-Speed Pre-Ignition (LSPI) protection chemistry that is essential for direct-injection turbocharged engines like the LSY. Earlier dexos1 Gen 2 or generic API SP oils do not meet this enhanced standard.
The 0W-20 viscosity provides near-instant lubrication to the turbocharger bearing at cold start, before boost pressure builds and temperatures rise. Using thicker oil delays this oil delivery and can cause early turbocharger wear.
Using incorrect oil will:
- ❌ Increase LSPI risk in the direct-injection LSY — a destructive pre-ignition event capable of bending connecting rods
- ❌ Delay cold-start lubrication to turbocharger bearings, accelerating wear at the shaft journal
- ❌ Void GM/Cadillac’s powertrain warranty — dexos1 Gen 3 is a mandatory warranty requirement
GM-Approved Oil Brands
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✅ ACDelco dexos1 Gen 3 Full Synthetic 0W-20
-
✅ Mobil 1 Advanced Full Synthetic 0W-20
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✅ Castrol EDGE Advanced Full Synthetic 0W-20
-
✅ Pennzoil Platinum Full Synthetic 0W-20
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✅ Valvoline Advanced Full Synthetic 0W-20
Look for the dexos1 Gen 3 circular certification mark on the bottle. Do not substitute dexos1 Gen 2 or generic API SP — the Gen 3 LSPI inhibitor chemistry is a different and stronger formulation.
Severe Service Check
You need the 3750-mile interval if you:
- Drive primarily in urban stop-and-go traffic with frequent cold starts
- Make mostly short trips under 5 miles (turbo does not reach full operating temperature)
- Drive in extreme heat (summer canyon or desert road use)
- Use Sport mode frequently for spirited acceleration
Installation Details
Drain Plug Torque: 18 ft-lbs
OEM Filter: ACDelco PF64
Aftermarket Filters:
-
Mobil 1 M1-113
-
K&N HP-1010
-
Fram Ultra XG10060
Pro Tip: The CT4 holds only 5.3 quarts — it is easy to overfill if you pour an entire 5-quart jug without checking the dipstick first. Pour 4.5 quarts, start the engine briefly to fill the filter, wait 5 minutes, then top up as needed. Overfilling a turbocharged engine can cause oil foaming.
FAQs
What oil does a 2023 Cadillac CT4 2.0T take? Full synthetic SAE 0W-20 meeting GM dexos1 Gen 3 certification and API SP. Do not use an oil that only meets dexos1 Gen 2 — the Gen 3 LSPI additive package is required for the LSY direct-injection turbo engine.
How many quarts does it need? 5.3 quarts with a new filter, 5.0 without. The CT4 has a relatively small sump for a luxury sport sedan.
Can I use 5W-30 for extra turbo protection? No. GM specifies 0W-20 for the LSY engine. The 0W cold rating provides faster oil delivery to the turbo at cold start than a 5W-30, and the 20-weight operating viscosity is calibrated for this engine’s tolerances and VVT system. Thicker oil is counterproductive.
What’s the difference between the CT4 and CT5 oil specs? Both use 0W-20 dexos1 Gen 3. The CT5 2.0T holds 5.3 quarts as well (same LSY engine). The CT5 V-Series with the 3.0L twin-turbo uses a different spec — always verify by engine variant.
How often should I change the oil? Every 7500 miles or 1 year under normal conditions. The GM Oil Life System (OLS) will alert you to change sooner if driving conditions are severe. Do not exceed 7,500 miles without an oil change.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-04-22 | Source: 2023 Cadillac CT4 Owner’s Manual