Ford Econoline E-150 Owner's Manual page 283

282
On all two-piece flat wheel nuts, apply one drop of motor oil between the
flat washer and the nut. Do not apply motor oil to the wheel nut threads
or the wheel stud threads.
2013 Econoline (eco)
Owners Guide gf, 2nd Printing, November 2012
USA (fus)
Wheels and Tires
Note: Inspect the wheel pilot hole
and mounting surface prior to
installation. Remove any visible
corrosion or loose particles.