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Adjust or replace your Brake Light Switch. It's under the dash by the brake pedal close to where it pivots. It should be white. It's a spring loaded pin that makes contact with your brake pedal lever (the metal part your rubber brake pad connects to).
Not familiar with this vehicle but exactly the same fault happens with the Vovo S80 if the steering column Control module loses power , then it's just a simple case of checking fuses or the heat sink to the dash display IC sometimes overheats . All you have to do there is replace heat paste and clean display plugs to fix , as I say not sure if this car has same or similar system .
Regular 5W30 oil will work just fine in the '03 CTS. Your owners manual
will tell you to stay away from any other viscosity (5W20, 10W30, etc)
because they will be either too thick or too thin. It does not require
synthetic as it is equipped with a 3.2 liter engine that was more or
less derived from the Catera, but just didn't break as much. They only
ran that engine for a year and started using the 3.6 liter VVT
(variable valve timing) which does require synthetic oil (5W30 Mobil 1).