Smoke colors are sort of subjective but in general.
White smoke from coolant burning looks like this -
Blue smoke from oil burning as it drifts you can see the bluish tint to the smoke. This smoke will stink, it does not come close to smelling good. -
Black smoke - Hard to see it but it will be dark colored smoke, usually thin, sometimes you can small the excess fuel.
Engine oil -
Black oil - has not been changed or engine is sludged up inside.
Coolant in the oil, will smell sweet, look like a chocolate milkshake and be sticky. (see picture) If the vehicle has been sitting long enough the coolant may settle out. This is even worse as coolant does not lubricate and will destroy the bearings in a short time.
Gas/petrol in the oil - The oil will be very thin and smell of fuel, usually it will be dirty as well as the fuel has "cleaned" the deposits from the engine.
Sunday, January 8th, 2017 AT 9:48 AM