[4Wheel]

Is this a V6?
If the "smoke" coming out the oil fill is also white, you have a blown head gasket. If you have a day or two to read all the posts you will find, do a search in this forum on "head gasket".
To prove this, buy or rent a compression gauge tester, check all cylinders and they should be the close to the same readings.
Also take a look at the spark plug tip condition.
White odorless smoke is a bad thing bad.