GM Parts Club
Hitch, wiring, brake controller and mirror checks. Applied to a 2020-2023 CT5, here is what that looks like.
Ignition and Engine Management
Watch for fuel economy that drifts down a mile or two per gallon over a few months. Iridium plugs on most modern GM engines are a 90,000 to 100,000 mile item. Coils are replaced on failure, not on a schedule.
Filters and Fluids
Watch for an oil life monitor that reaches zero faster than it used to. Follow the oil life monitor rather than a fixed mileage. Engine air filter every 30,000 to 45,000 miles. Transmission service intervals vary widely by transmission and by whether you tow.
Suspension
Watch for uneven or feathered tire wear on the inside or outside shoulder. Shocks and struts are wear items. Plan on inspection at 50,000 miles and replacement somewhere between 60,000 and 100,000 depending on road quality and load.
Cooling System
Watch for having to top off the surge tank more than once a year. GM’s long-life coolant is generally rated for 5 years or 150,000 miles on the first fill and 5 years or 100,000 miles after that. Hoses and the surge tank should be inspected annually once past 80,000 miles.
The Short Version
- Spark plugs: The same nameplate can have three different engines in one model year. VIN is the only reliable way to get the right plug.
- Oil filters: Engine size and emissions equipment change the filter, and diesel filter kits in particular are not interchangeable across model years.
- Shocks: Trim and package content matters enormously here. Off-road packages, air ride and adaptive or magnetic damping all use different parts than the base vehicle wearing the same model name.
- Radiators: Engine, tow package and rear-A/C content all change the radiator and hose part numbers. Have the VIN ready.
Ordering is easiest if you have the VIN in front of you. Head to our Cadillac OEM parts catalog to shop by vehicle, or search for CT5 parts to go straight to a part.
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