could be. if you stand behind the tail pipe while it is running, this may sound weird...but smell the white smoke.. just a little!!!! see if it smells sweet. coolant has a sweet smell and you could probably smell it if it is coming from there. if it is leaking in the head, your oil should be milky too from the mix of oil and coolant. my head gaskets leaked, but only to the outside. that, I was told was due to a lack (before I got it) of not changing the coolant regularly. the chemical process of the coolant with the aluminum eroded the gaskets.