[cotbu]

if you are using coolant and not just water and the headgasket is leaking coolant into the combustion chamber, then there will be white smoke accompanied by a sweet smell. If you don't have the tools to do the proper testing, or smell coolant burning. Then remove the exhaust from the turbo dump(elbow) back. At operating temperature if coolant is mixing anywhere in the combustion chamber it will show then at the turbo outlet. This is to eliminate the moisture in the exhaust system, some confuse as coolant burning!