2026 Cadillac CT5 maintenance schedule
Schedule type: oil-life monitor (GM Engine Oil Life System)
The car calculates oil life from how it's driven and shows CHANGE ENGINE OIL SOON. Change the oil and filter within 600 miles of that message and at least once a year. Cadillac still wants a tire rotation, oil-life check and multi-point inspection every 7,500 miles. The engine air filter has its own life system that tells you when to inspect or replace it. The 6.2L V8 (LT4) uses dexosR oil; the 2.0L and 3.0L use dexos1. Summarized in our own words from the source listed. Always follow the owner's manual or your dealer for your specific vehicle (VIN, engine, and options).
Checked against the official document for model year 2026; other years in this range are assumed to follow it. Confirm in your owner's manual.
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7,500 miles
Repeat every 7,500 miles.
- Rotate tires; check oil level and oil life and change oil and filter if due; multi-point inspection; lubricate body components DIY
Change oil and filter when CHANGE ENGINE OIL SOON shows (within 600 miles) and at least once a year.
Parts: Oil filter
22,500 miles / 24 months
- Replace passenger compartment (cabin) air filter DIY
Every 22,500 miles or 24 months, whichever first. More often in heavy traffic, poor air quality or dust.
Parts: Cabin air filter
- Replace engine air filter DIY
No fixed mileage: inspect at the next oil change when CHECK ENGINE AIR FILTER shows, and replace when REPLACE ENGINE AIR FILTER SOON shows.
Parts: Engine air filter
45,000 miles
- Change rear axle fluid (with limited-slip differential) Shop
Severe service: Severe schedule lists it at 45,000 miles too.
- Change automatic transmission fluid and filter Shop
Severe schedule only.
Severe service: Severe schedule: every 45,000 miles.
- Change manual transmission fluid Shop
Severe schedule only.
Severe service: Severe schedule: every 45,000 miles.
- Change transfer case fluid Shop
Severe schedule only. On the normal schedule this is at 97,500 miles.
Severe service: Severe schedule: 45,000 miles.
- Change front axle fluid Shop
Severe schedule only. On the normal schedule this is at 150,000 miles.
Severe service: Severe schedule: 45,000 miles.
60,000 miles
- Replace spark plugs; inspect wires/boots Shop
Severe service: Under extreme driving conditions plugs may need replacing more often; ask a GM dealer.
Parts: Spark plugs
75,000 miles
- Change rear axle fluid (without limited-slip differential) Shop
Severe schedule only. On the normal schedule this is at 150,000 miles.
Severe service: Severe schedule: 75,000 miles.
97,500 miles
- Change transfer case fluid Shop
Don't power wash the transfer case or axle output seals; water can get past the seals and contaminate the fluid.
100,000 miles / 120 months
- Replace hood/body lift support gas struts DIY
Or every 10 years, whichever comes first.
150,000 miles
- Change rear axle fluid (without limited-slip differential) Shop
- Change front axle fluid Shop
- Drain and fill engine cooling system Shop
150,000 miles or 6 years, whichever first.
36 months
- Replace brake fluid (manual transmission cars, every 3 years) Shop
60 months
- Replace brake fluid (automatic transmission cars, every 5 years) Shop
84 months
- Replace A/C desiccant (every 7 years) Shop
Sources
Always follow the owner's manual for your exact vehicle; intervals can differ by engine and market.