Just remember that these Windsor block's are the same that they used in the late 60's early 70's and from then on, nothing has changed muched, sure they now have EFi and modern technology but the block etc is still identical, and they didn't use full synthentic back then, I use the Shell Ultra+ as well and have no noise what so ever or problem's, I don't believe in using full synthetic as Ford reconmend, like other's have said they only use this to prolong service interval's, which is a no no.
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