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The 6/12 PS was a car mid-range produced by the carmaker German Opel between 1909 and 1910.

The 6/12 PS was introduced to replace the 8/9 PS in the range of middle-class cars. It was in fact the first Opel end of this range autonomamamente designed and built by the House of Rüsselsheim, since the immediately preceding models were produced under license from Darracq. The 6/12 PS was though to be positioned slightly higher up, is for the most power of its engine, both for the fittings and the bodywork available. The 6/12 PS was in fact available in three body variants: single- phaeton, double-phaeton or even landaulet. The 6/12 PS was fitted with a motor with 2 cylinders from 1527 cm ³, capable of delivering a maximum power of 12 bhp. The distribution was side-valve. The cooling was to water. The transmission was a universal joint, traction was back and the change was a three-speed transmission. The suspension resumed the pattern of 9PS, i.e. rigid axle with semi-elliptic leaf springs. At 6/12 PS was soon joined by a slightly more powerful version, the 6/14 PS, equipped with a new 4-cylinder 1544 cc capable of delivering 14 PS of maximum power. It was available in the same body styles of the 6/12 PS. The 6/14 PS survive the 6/12 PS. In fact it will be removed from production by the end of 1909, while the 6/14 PS was retired at the end of the following year.