UKPassats

Three of the four doors on my passat estate have become very stiff to open and close. I have lubricated al three with various oils and grease to no avail. The hinges look in good condition and actually did look well lubricated to start with. There is no rust on the hinges and the other door shuts just as you would expect. There has been no accident damage .
I wonder if anyone has any ideas or had a similar problem. thanks in advance