Seeing that you are frm Mn. I would like to ask what kind of driving the car does. Short drives and not getting warmed up long enough to evaporate out the condensation and this going on repeatedly will cause a build up of water in the oil and in turn very sludgy or foamy oil. If you aren't loosing coolant or if the water in the oil is not the color of the coolant after it has had a chance to settle out some what it isn't a head gasket.
I recommend changing the oil and filter and doing so more frequently.
PS: what do you mean by blown engine problem?