When you service a Cadillac CT5, the oil you choose isn’t a guess—it’s an engineering requirement tied to the exact engine under the hood. At Turan-Foley Cadillac, we match your CT5’s engine code to the GM specification and viscosity so you get the correct protection, warranty compliance, and consistent performance in every season.
2026–2025 CT5 2.0L Turbo (LSY): Oil type
Use full-synthetic SAE 0W-20 that meets GM’s dexos1 specification. This is the factory-specified viscosity for the LSY turbo-four and has carried forward across recent CT5 manuals and GM service publications.
2026–2025 CT5 3.0L Twin-Turbo V6 (LGY): Oil type
Use full-synthetic SAE 5W-30 meeting dexos1. For extreme cold (below −20 °F / −29 °C), Cadillac permits SAE 0W-30 (still dexos1) to aid cold starts—otherwise stick with 5W-30.
2026–2025 CT5-V Blackwing 6.2L Supercharged V8 (LT4): Oil type
Use full-synthetic SAE 0W-40 approved to GM’s current high-performance dexosR (formerly referenced as dexos2 for this application). GM’s service literature lists 0W-40 dexosR for the CT5 LT4, and Cadillac’s owner materials specify 0W-40 with a Mobil 1 recommendation for this engine.
2024–2020 CT5 2.0L (LSY) and 3.0L (LGY): Oil type
For all non-Blackwing CT5 models from launch through 2024, the oil specs are the same as today: LSY uses SAE 0W-20 dexos1; LGY uses SAE 5W-30 dexos1, with 0W-30 allowed only in extreme cold.
2024–2022 CT5-V Blackwing 6.2L (LT4): Oil type
These model years also require SAE 0W-40 in the LT4. GM later standardized the label as dexosR 0W-40 across performance V8s; Cadillac manuals list 0W-40 and recommend Mobil 1 for this engine.
Oil capacity at a glance (with filter)
If you’re curious about sump sizes we see in the shop: LSY 2.0L—about 5.3 qt; LGY 3.0L—about 6.0 qt (RWD) or 6.5 qt (AWD); LT4 6.2L—about 9.0 qt. Always fill to dipstick/monitor, not blindly to a number.
Why this matters—and how we service it at Turan-Foley
Modern Cadillacs use advanced variable-pressure oiling and tight bearing clearances; the wrong viscosity or a non-dexos oil can compromise wear protection, turbo cooling, and emissions hardware. Our technicians pull your engine code (LSY/LGY/LT4), confirm the latest GM standard (dexos1 or dexosR), set the correct torque on the drain hardware, prime the new filter, top off precisely (not overfilled), and reset the Oil Life Monitoring system. If you drive in sustained extreme heat, repeated short trips, or track your Blackwing, we’ll tailor intervals while staying inside GM’s guidance.
Conclusion
Across every CT5 model year, the oil choice comes down to engine family: 0W-20 dexos1 for the 2.0L LSY, 5W-30 dexos1 for the 3.0L LGY (0W-30 only for deep-cold starts), and 0W-40 dexosR for the LT4 Blackwing. Bring your CT5 to Turan-Foley Cadillac and we’ll apply the exact specification for your VIN so the engine stays quiet, clean, and protected—mile after mile.
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