COLUMBUS, Ind. (AP) _ Cummins Inc. says it will add 500 jobs over several years at its Columbus plant to build V8 turbo diesel engines for Nissan Motor Co.'s next generation Titan pickup truck.
 
  The Columbus-based company said Tuesday its V8 program is planning to add to its current 300-person workforce over the next several years and eventually expects to employ about 800 workers.
 
  Nissan announced separately that a 300-plus horsepower, 5-Liter diesel engine made by Cummins will be available as an option on the next generation Titan. Nissan wouldn't say when the reworked full-size pickup truck will arrive in showrooms, but said the diesel versions are being tested on public roads.
 
  Cummins says it's also developing a version of the V8 turbo diesel for commercial vehicle customers.