No, the slowest diesel is this diesel:

http://www.bath.ac.uk/~ccsshb/12cyl/

25,480 liter straight 14 cylinder

108,920 hp at 102 rpm
5,608,312 ft-lbs of torque at 102 rpm

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record