This is a new to me C7. Car was up to operating temp and it was a cool evening about 55 degrees. I checked the oil level after the video and it is clean but it seems high to me.
Smell is a good indicator as well. If it smells burnt kinda tar or fresh asphalt that is usually oil. If it smells sweet that is usually coolant. Water vapor generally smells like nothing or steam.
You can also pull a spark plug and look for fouling.
I have the same problem with my oil is super clean and hard to see. The only way to really fix the oil level is to change the oil and put in the correct amount. If the smell goes away after a bit when you change the oil then it was overfilled.
Leak Down Test may help diagnose. Also, "smoke" from water vapor feels like water when you rub it between your fingers, like oil if it is not water.Kind of hard to tell whether its smoke or vapor. Does kind of look like smoke, but:
- You say the oil level seems high. Are we dealing with dry sump (Z51) or normal engine? I'm assuming non-Z51, but please verify.
- If a dry sump, are you familiar with the procedure for checking the oil level?
- How many miles on the engine?
- How did you warm the engine and for how long? And how long was it not running until you started it for the video? At 55*, depending on the location, its possible for a warmed engine to blow vapor on a restart as the exhaust is probably the first thing to cool off and vapor forms as the exhaust re-heats.
- Does it smell like smoke? or just exhaust?
I would do a cold (first of the day) start and see how how it does. Leaky valve seals will smoke on a first start and a re-start after setting a bit. Then take it for a ride, leave it running, set up the camera, and give it few raps and see if it smokes then. And maybe not so close to see more of the smoke/vapor and the color. If it is really smoke the next step would be a compression test to determine valve seals or rings.