Oil is an essential lubricant in your engine. It lets metal press against metal without damage. For example, it lubricates the pistons as they move up and down in the cylinders.
1 By the time of the Japanese surrender in August 1945, Korea was the second-most industrialized nation in Asia after Japan itself.  But the wartime mobilization of 1937-45 had reintroduced harsh measures to Japanese colonial rule, as Koreans were forced to work in Japanese factories and were sent as soldiers to the front.
Independence Day of South Korea. South Korea celebrated 15th August as the Independence Day, when it gained freedom from the clutches of Japan. South Korea attained complete sovereignty on the 13th of August, 1948, but officially celebrates its state of independence on the 15th August. Independence Day in South Korea is a public holiday.