Joined: Apr 2006
Location: On the road n NE Oklahoma
I use Mobil 1 15w-50 full synthetic oil. Been using it for the last 17 years in numerous Mustangs, Shelbys, Big Block Gaxaxies, vintage Thunderbirds, various British vintage sports cars including Jaguar E type, Triumph TR3 & TR6, MGA, etc. at least 250,000 cumitiive miles. There is no question that a quality full synthetic oil will reduce wear, to the point you can't even measure wear after 80,000 very hard miles on my last Shelby GT350. A fantastic oil for vintage engines. It has plenty of zinc (zddp) that vintage engines require ( 1300/1200 .ppm).
'65 K code Mustang
& a few '66 GT350's (1970-2012)