Oil pooling in top of cylinder head.

[TonyMathis]

We have two pump and injector rebuilders in my area. Both are staffed by men who
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You're absolutely right about owning a shop and using Genuine Cummins parts and if you're honest you'll admit a lot of it has to do with the ignorance of the customer who will blame any problem on using aftermarket parts. Experienced mechanics shouldn't exhibit the same ignorance.

Frankly I'm sick of this ISX. The casting are soft compared to other engines including other Cummins. Parts are outrageous in large part due to distrust of aftermarket suppliers. Reliability is suspect. The EGR system is a joke considering carbon clogging of the head is damn near routine maintenance. And above all the lubrication system is inadequate and prone to cause to early failure. My Detroits and Cats are far superior engines in economy, reliability and cost of repair.

The one thing Cummins had for years over the other manufacturers was cost of ownership. They beat Cat in repair cost and Detroit on fuel economy and reliability neither of which is true now. They are worse than both. I regret the day I gave the ISX a chance and advise anyone considering what engine to have in a truck to go with a Detroit.