Is my Cadillac XT4 losing oil, or is the transmission failing?

Short answer: An XT4 that's down a quart after 3,000 miles may be within normal use, but a dealer-found leak is a warranty repair. A transmission that locks up is a dealer repair, and a GM recall covers a transmission part on some 2019-2020 XT4s, so check your VIN.

Symptom: The oil level drops between changes, or the transmission locks or fails.

What to check first

1. Check your oil every 1,000 miles or so and write it down.
2. Look for oil spots under the car.
3. Check your VIN at nhtsa.gov/recalls for the transmission accumulator recall.
4. Keep every service invoice.

Likely causes

1. Normal oil use or a cam seal leak. Turbo engines can use some oil. A dealer told one owner a cam seal was leaking.
2. Internal transmission failure. A transmission that locks the wheels needs dealer diagnosis and, on new cars, warranty replacement.
3. Recalled transmission part. A GM recall covers a start/stop accumulator end cap on the transmission of some 2019-2020 XT4s that may be missing bolts (see below).

What it usually costs

Owners' repairs were done under warranty. Out-of-warranty prices weren't posted. Get a quote.

Is it safe to keep driving?

A transmission that locks the wheels is a serious safety risk. Don't drive it; have it towed. Low oil can damage the engine.

DIY or shop?

Checking oil is DIY. Leaks and transmission work go to the dealer under warranty.

Recalls, bulletins and complaints in plain words

• Related recall: NHTSA lists 20V668000, which covers 2019-2020 XT4s and other GM models: the start/stop accumulator end cap on the automatic transmission may have missing bolts. Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• Plain words: That recall is about a missing-bolt problem on a transmission part, not the lock-up one owner described, but it is free to fix, so check your VIN.
• NHTSA complaints: 17 keyword-matched complaints for Cadillac XT4 2019–2023 (of 68 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-28; keywords: oil, consum, transmission, shift, jerk, shudder, hesitat) (NHTSA returned no data for 1 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2019 Cadillac XT4 oil loss on Car Talk, a 2019 XT4 owner found the oil a quart low 3,000 miles after a change. The dealer blamed a cam seal. Members said a quart in 3,000 miles is within normal use but that the powertrain warranty covers a leak, and to check oil regularly.
• In 2023 Cadillac XT4 - Transmission issue on Car Talk, the front wheels of a 2023 XT4 locked at 800 miles and the dealer replaced the transmission. Members said to keep every service record in case lemon law applies.

Quick tip

Keep records. They protect you if the dealer has to try more than once.

Vehicle focus: Cadillac XT4, 2019-2023.

Safety / mechanic note

Wheels locking is a crash risk. Verify with a mechanic.