I have never had an extended warranty. @jmperlik has done a lot of research on these. I also have not heard of Ford offering one for issues with our trucks, but hopefully someone will have better news.
The rubber stopper can (in my opinion) become dislodged sideways and either self reset or be pushed back into place. Note this photo from earlier showing the stopper top and the large circular spring. Also note the attachment point of the spring, the "X" shaped place opposite of the blue arrow. It is relatively easy to pop the spring up and remove it, then pop it back into place. I have done this. I would be reluctant to do all the oil cooler replacement unless it is absolutely necessary.
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The rubber stopper can (in my opinion) become dislodged sideways and either self reset or be pushed back into place. Note this photo from earlier showing the stopper top and the large circular spring. Also note the attachment point of the spring, the "X" shaped place opposite of the blue arrow. It is relatively easy to pop the spring up and remove it, then pop it back into place. I have done this. I would be reluctant to do all the oil cooler replacement unless it is absolutely necessary.
