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JD, 5 qts. has been the standard for years. I have read the 6 qt. debate on this website also, but the last time I changed the oil in my FE, I continued the 5 qt. tradition. I have never read about a street FE that was harmed by running 5 qts.
I have allways run 5qts in all my Fe engines, I was taught that over filling a engine with oil was not good, the crank and rods turning in the oil would cause the detergents in the oil to foam, creating air pockets in the oil passages. Though this is infromation that I learned back in the 60's from some of the old machanics that my father knew at the Ford garage, I still go by it.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.