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My 04 C 5500 was good till 80K, then injectors, if you read around on this site you will see that it is a major issue with the LB7 engine. 04 was a transition year, they changed motors midway through, off the top of my head I cant tell you how to tell the difference, I know it has to do with last number of vin. Watch for alot of smoke at idle, motor oil overfull, pervasive smell of diesel, all signs of injector failure. Good luck
 
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