Good morning.
Coolant leaks, as a matter of fact any leaks, do not fix themselves. There is a reason for the leak. Did it leak externally?
Oil in the coolant is usually a result of a cracked engine block. Advanced diagnostics would need to be done by a shop familiar with this issue. If your truck has an oil cooler, that could be a source as well. This all needs to be checked and confirmed.
What has been checked?
Roy
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Tuesday, May 15th, 2018 AT 3:49 AM