2018 Cadillac CTS-V — coolant is old by age but mileage is low — second opinion before I spend money

Intermittent stuff lies if you only catch it once. A pressure test beats staring at a dry driveway if the 2018 Cadillac CTS-V is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. On “v — coolant is old by age,” that was the fork that mattered for me. Write the result down so the next test isn't a repeat of the last one. Not driving it hard until I know more.

I wouldn't throw parts yet. If a shop can't duplicate it on the 2018 Cadillac CTS-V, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. That's the whole play. I'll update if anything new shows up.

Tried a second charger / second scan and the story on the 2018 Cadillac CTS-V didn't change. Parking it somewhere I can hear it better next time.

Start with the test that can prove you wrong. Move a coil or plug on the 2018 Cadillac CTS-V if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. I'd want a dollar figure or a measured spec, not 'should be fine.' Not interested in a five-hour wait for a shrug.

Cleared nothing. I want service to see the alert on the 2018 Cadillac CTS-V first. I already checked the easy fluid levels.

Ask what changed right before it started. If a shop can't duplicate it on the 2018 Cadillac CTS-V, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. I'd want that in writing, not as a promise. Make the next action something you can finish this week. Might be overthinking it, but I'd rather overthink than overspend.