Coolant leak

water in the oil will turn it white, water in exhaust my be hard to see, but will change the color of the exhaust, you can put your hand over the pipe and feel it if its bad. A radiator shop has a thing that goes on the cap and will tell you if there is combustion products in the water.

You can all so get a leak down detector that goes on the cap, and pressurize the system to see if you see any thing. This saves you from being around a hot motor with moving parts to dodge.