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.
On June 25, 1950, the Korean War began when some 75,000 soldiers from the North Korean Peopleâs Army poured across the 38th parallel, the boundary between the Soviet-backed Democratic Peopleâs Republic of Korea to the north and the pro-Western Republic of Korea to the south.