Rot Box
Explorer
Something to note that may not be common knowledge, if the engine has an oil cooler and there is trash in the oil the best course will be a new one. At the very least it will need to be thoroughly flushed, but there is no guarantee that it is ever completely clean.
This is very good advise. I have seen two brand new engines wiped out because of this problem. The cores are very difficult to clean out completely I would remove it clean/inspect it thoroughly.