Date registered: Feb 2008
Vehicle: 1987 420SEL
Location: Ontario, Canada
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You can jump start new vehicles; any opinion contrary is simply not true.
In nearly all cases, it's the operator's error in connecting the jumper cables. I've jump started plenty of machines, from 2006 and newer, to positive ground Ford 9N tractors.
As stated above, always follow the instructions in the owner's/shop manual. Generally, newer cars require that you connect the ground jumper to a chassis ground on the dead vehicle. Most warnings that advise against jumping a vehicle (assuming they exist; I've never seen one, but the rumours are circulating) assume, as most consumer instructions do, that you're a complete moron who has a better chance of frying the ECU in the connection of cables than actually jumping the car.