Have no issues whatsoever with white smoke after they did their work. At this point, I am just going to add the coolant filter and hope for the best! As I said, I drive it twice a week for a whopping 64 miles total and then maybe a dozen times during the summer for about another 3-4k miles. Again, still at a loss on this oil cooler. If it is so simple and provide such great value, why would Ford just not add one for 125.00 or so? Again, I guess that would be admitting there is a problem.