I'm putting a new Ford Coyote 5.0 liter 435 hp crate engine in my 1968 Ford XL. This is basically the same engine as the 2017 Ford Mustang GT. Ford Performance says to use 8 quarts of Motorcraft SAE 5W-50 Full Synthetic or XO-5W50-QGT or equivalent. The 2017 Ford Mustang GT (same engine) specifies 5W20. Car will be manual transmission and used daily (never will be raced).
Is the difference simply that Ford Performance is assuming crate engines are primarily used for racing and therefore specifying the 5W50?
Which should I use?
Is the difference simply that Ford Performance is assuming crate engines are primarily used for racing and therefore specifying the 5W50?
Which should I use?