In 1966,
Check the oil that's used in all the new cars and trucks(syn.) Yes, it's worth 1 1/2 mpg
in my Truck...Over 100,000 miles and you can eat off the top on the engine...I would use nothing but Syn.oil... My race car has seen nothing but, motor is like new..Yes, it's worth some HP..Good Luck on your project... Dave..1033
