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.
Korean Service Medal and Ribbon. History - Established 1950. Established in November of 1950, the Korean Service Medal honors United States Armed Forces personnel who carried out service in Korea between the dates of June 27, 1950 and July 27, 1954 during and shortly after the Korean War.