Yes thanks for the update and based on your post I would agree that you’ve done everything you can but the fact that they won’t let you use the correct oil makes the diagnosis incomplete in my opinion but since it’s out of your hands I wouldn’t’ worry about it, perhaps if that find incorrect oil to be the cause they will change their policy on ‘one oil fits all’ which will help prevent future problems not just with that vehicle but with others as well, to me that view seems very short sighted, there are other ways to save money after all.
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