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.
The Korean War was fought between North and South Korea, between 25 June 1950 and 27 July 1953. The United Nations, with the U.S. at its lead was aligned with the South, while China fought on the Northâs side, with help from the Soviet Union.