How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Cat Man Your Own Question
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8417
Experience:  I am ASE Master Truck Certified.
30708357
Type Your Medium and Heavy Trucks Question Here...
Cat Man is online now
A new question is answered every 9 seconds

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.

Related Medium and Heavy Trucks Questions