I have a 2019 Cadillac XTS 3.6 with 132,500 miles. Should I add 1 can to my full tank or wait until I’m almost empty? [SOLVED]

Thanks for the question!

For your Cadillac, I’d recommend using High Mileage Sea Foam for its extra cleaning strength.

You can add a full can to a full tank, but if your goal is cleaning, I’d recommend waiting until you have about 1/4 tank or less and adding a full 16 oz can of High Mileage. The higher concentration will work much better and faster to clean fuel gum and varnish deposits from the fuel injectors and fuel system.

After adding High Mileage, drive at least 10–20 miles before refueling to give the higher concentration time to work.