Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,In most cases diesel fuel in the oil is caused by either leaking injectors or the return lines are leaking. Start first with removing valve covers to check for any leak on the return lines. If no leaks are found with the return lines , then replace all the injectors. They are very common to crack and leak into the engine. Unfortunately there really i is no good way to determine which injector it is leaking , so it common practice to go ahead and replace them all which should solve the problem.
If you calling the rocker box the valve covers then yes. See the enclosed steps in the link below. Copy and paste the link to your browser to open and view the steps. Have look and post if you have and or need more help. Please take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.Thank you again.https://dl.dropboxusercontent.com/u/104923897/Injectors%20Feb%2015.pdf