Welcome to CF!

Lots of info for you to search here.

What year is your CT6?

Coolant flush and brake fluid change should be done at 5 year mark.

Oil change if it has not been done in the last year, otherwise go by the Oil Life Monitor. Use the recommended oil (see owners manual).

Tire rotation every 5-8 thousand miles. New tires at around the 6 year mark - age of tires, not the car.

Cabin air filter - once every one to two years depending on environment driven in.

All this and more maintenance items can be found in your Owner's Manual.

 

2018

thank you so much! Very very helpful!

 

Yes, welcome to the Cadillac Forum. It sounds like you're overdoing it on the maintenance front. Keep it up, you're doing it right.

Dealers can be (generally) counted upon to keep up with any outright recalls, but go after any TSBs as well:

https://static.nhtsa.gov/odi/tsbs/2020/MC-10180294-9999.pdf

 

Reviewing my owners manual and lo and behold I learned of a maintenance item that I never been familiar with in past. The item is called "Air Conditioning Desiccant" and supposed to be replaced every 7 yrs. I have a 2019 CT6 and would seem that would suggest I'm due to replace. Anyone had this done and if so what was the cost to do it? Did dealer or independent? Owners manual indicates "can be complex" see your dealer.

 

Also known as the "receiver/drier," this part is typically replaced any time the a/c system is opened (as for a component replacement), but is not serviced at any other time.

Its purpose is to remove any residual moisture in the system that is left over after vacuuming prior to charging with refrigerant. If your system has never been opened (never had the hoses disconnected from the compressor or condenser), then it's not possible to have introduced any moisture and therefore your desiccant does not need to be replaced.

So if you find your AC not working and someone diagnoses a leaking hose or a failed compressor, they would replace that component as well as the receiver/drier.

If that has not happened, then your system still has nearly 100 PSI of refrigerant charge in it, making it impossible for any moisture to seep in and use up your desiccant

 

Great explanation and appreciate it. Weird how owners manual suggest replacing at 7 yrs.