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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8867
Experience:  I am ASE Master Truck Certified.
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I had 5.0 % diesel fuel dilution in engine oil. I replaced

Customer Question

i had 5.0 % diesel fuel dilution in engine oil. I replaced injectors, sampled oil 25,000 miles later and had 4.4 % diesel dilution. how would fuel get into oil?
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.

Thanks for asking your question. I will try and help you out.

There are three ways fuel can enter the oil.

The first and most common is a leak at an injector. Which you have already replaced.

Second is a leaking shaft seal on the fuel transfer pump. I would change this next.

And lastly is a cracked head. Cracked heads that cause fuel to enter the oil are very rare. I've only seen it once in all my years.

Please reply back if you need more help or have more questions. I am happy to assist.

Expert:  Cat Man replied 1 year ago.

Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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