FORD 2013 E-450 v.3 - Manual (Page 278)

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.
Note: Inspect the wheel pilot hole
and mounting surface prior to
installation. Remove any visible
corrosion or loose particles.
Wheels and Tires 277
2013 Econoline (eco)
Owners Guide gf, 3rd Printing, May 2013
USA (fus)