Bruce of MN Well-known member Nov 29, 2015 #1 Seems pretty thorough: http://www.roadandtrack.com/car-culture/classic-cars/videos/a27447/vintage-1937-film-explains-motor-oil/
Seems pretty thorough: http://www.roadandtrack.com/car-culture/classic-cars/videos/a27447/vintage-1937-film-explains-motor-oil/
