The Wedding Waltz (1988)

Viltteri, a balding guy in his thirties living in rural northern Finland, is hopelessly clueless about his new role as a married man and the father of a newborn son. A perfect escape from family responsibilities is having to get his old Hillman Minx repaired and inspected for road-worthiness, with a little help from an eccentric bunch of friends who never seem to have grown up either.