5.9 Cummins Diesel Engine Problems, MPG, Oil Capacity/Type

The 5.9L Cummins Turbo Diesel Engine has had a few problems such as:

  • Engine Block Crack
  • Fuel Lift Pump Failure.
  • Leaking Fuel Injectors.
  • Exhaust Manifold Cracks and Leaks.
  • ECM Failure.
  • Accelerator Pedal Position(APPS) Sensor Failure.

Video explain everything wrong:


Owners have reported gas mileage of 18 mpg in city, 25 mpg on hwy.


It uses 12 qts of 15W-40 or 5W-40.

The oil change interval is every 7k miles.


Engine Specs:

160 hp at 2,500 rpm
400 lb-ft at 1,600 rpm
359 CID nominal, 5.9 liters nominal
I-6, 4 cycle diesel
bore 102mm, stroke 120mm
Cast iron engine block and cylinder head
Weight 1150 lbs dry
Size 40 x 25 x 38 inches

The life expectancy is 350k miles.