Cadillac CT4 Filters and Fluids Service Guide (2020-2023)

The filters and fluids system on the 2020-2023 CT4 is not complicated, but it is easy to spend money in the wrong place on it. This is the version we give people at the counter.

What You Will Notice First

A diesel that derates or throws a fuel pressure code on a neglected filter
A slight hesitation on hard acceleration with a dirty air filter
An oil life monitor that reaches zero faster than it used to
Reduced airflow from the vents

None of these are emergencies on day one. All of them get more expensive if you sit on them.

The Parts Involved

Oil filters.
Air filters.
Cabin air filters.
Fuel filters.
Transmission filters.
Dexos engine oil.
Differential fluid.

Why the Factory Part Matters Here

GM oil filters are built to a specific bypass pressure and anti-drainback valve spec, which matters most on cold starts.
Dexos1 and dexos2 licensing exists because GM engines have specific requirements, and warranty language references it directly.
Air filter media density affects the mass airflow reading, which is a fueling input.

Service Interval

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.

Ordering Notes

Engine size and emissions equipment change the filter, and diesel filter kits in particular are not interchangeable across model years. On the CT4 specifically, trim and package content is the thing that trips people up.

We are a factory GM dealer, not a reseller, so what you order is the same part the service drive installs. Browse our Cadillac OEM parts catalog or search for oil filters.