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Next is the expander ring, also known as the first oil ring. This ring's job is to provide outward tension on the oil rails against the cylinder wall. With the expander ring set, the two thinner rings were placed-one on the bottom and one on the top. Consolo went on to say that you should never face the two ring gaps on top or in line with one another, which would allow excessive amounts of oil to get past or leak by the oil ring.