Diesel trucks have diesel engines. Diesel engines require mone
maintenance, oil change air and fuel filter replacement than
gasoline vehicles. See this website:
www.autorepair.about.com/cs/generalinfo/a/aa102001a_3.htm
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Most problems with the 6.0L diesel engine can be traced back to
lack of maintenance or improper maintenance by the customer.
When well maintained most do not have a lot of trouble.