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At the first oil change it is OK. That is when it is recommended you wait to switch over. As for your second question, I like and use all Royal Purple products and American Muscle carries the oil at a better price (w/forum discount and free shipping) than anywhere else I have found. I pick up the Motorcraft oil filter from Wally World because it is only about $3 there. From there, the dealership does the oil change for about $10 using my oil and filter, and disposing of the old oil and filter. So, it comes to about $45 for a full synthetic oil change for me which IMO isn't too bad.
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