Is Royal Purple strictly a synthetic oil? My car has 91k on it (got at 88k) and I've been told switching to synthetic at this milage is inviting trouble to cause leaks. Input?
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne