My 2004 Mazda 6 has white smoke coming out of the exhaust. How much does this repair...

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yokes1869

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...generally run? There's no oil in the coolant and no coolant in the oil...but I'm assuming it's a blown head gasket. The engine has never overheated, and I'm conveniently over my warranty at 62k+ miles. Just looking for advice/info so as not to get screwed when I take it in. Thanks in advance for your help.
 
The head gasket may be leaking coolant into a cylinder. Check all the spark plugs and look for the one plug(s) that appear greenish or wet. That will narrow it down a little for you. Also, keep in mind, it could also be the cylinder head has cracked between a water jacket and a combustion chamber (cylinder). Has this car overheated, or been low on coolant recently?Both are major repairs since the cylinder head needs to be removed, which also includes the timing belt, manifolds etc. Part costs should be approximately $300 for a new cylinder head and $50 for a new gasket. Labor costs should be about $400 to $600 at a regular shop and about double at the stealership (parts double too).
 
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