Vehicles

Cummins 8.9 ISL Problems, Oil Capacity/Type

The Cummins 8.9 ISL was made from 1999-2007.

Owners have reported these problems:

  • Turbo hose falls off
  • Water pump fails
  • EGR cooler breaks
  • Grid heater plugging
  • Camshaft Failure
  • Crankshaft Failure
  • Lifter/Roller Failure
  • Connecting Rod Failure
  • Spun Crankshaft Bearings
  • Cracked Cylinder Head
  • Scored Pistons and Liners
  • Over Fueling
  • Lack of oil or oil pressure
  • Extreme Blow By
  • Dropped Valves
  • Overheats going uphill

 

The engine uses 24 qt of 15-40W or 10W30.

It is used in buses, trucks, and motorhomes.

It sounds like this:

 

Specs:
6 cyl diesel engine turbo charged
8.9 L (541 ci)
bore 114mm, stroke 145mm
16.6:1 compression
280 – 400 HP
700 to 1255 ft-lbs
Weighs 706 kg dry
Cast iron cylinder head and block
8 MPG in city

There are 3 versions of the 8.9:

ISL 1999-2007
ISL9 2007-2017
L9 2017+