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BN_Porche308_02.jpg (01202) 558833<br />
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Potty petrolheads will have to part with nearly £20,000 to get their hands on the slowest Porsche ever made - and will have to remember to put diesel in the tank of this rare 55 year-old Super 308 tractor. The machine boasts a top speed of 15mph and takes over a minute to go from 0-15mph, powered by a three-cylinder 2.6L 38 horsepower engine. The two-tonne tractor was built by the German motor firm in 1958 six years prior to the launch of their iconic 911 model and was used as an agricultural workhorse.