Annual Oil change and grease

The last couple of years i have been changing the oil before we head out for the summer....we don't put many miles on at all.  I know that when service places do oil changes they also use a grease cartridge....my unit is a 2910T with ford e450.  Any advice on the necessity of doing the grease as I am not sure if necessary and if so where to apply it.  Thanks

I think there are 4-5 fittings, all easy to reach on steering linkage. My also has a fitting on the first driveshaft yoke.
Grease gun with tubes of grease are inexpensive and a simple job to do as long as you are under there changing the oil.

I would surely grease all points every 10,000 miles.

Elaborating here a little more on what keelhauler stated........

Locations of grease fittings are as follows.
- 1 upper grease fitting per front wheel
- 1 lower grease fitting per front wheel
- All steering linkage grease fittings, at least 3 maybe 4 or 5...... I don't recall the exact quantity.
- Some E350s and/or E450s have grease fittings in the U-joints.  My 2007 E350 does not.

It is possible that you have a tiny bolt (a hex cap) instead of a grease fitting in any of the places mentioned.  The cap needs to be replaced with a grease fitting, either a straight fitting, a 45 degree fitting, or a 90 degree fitting pending the access to it.  Then leave the grease fitting in and discard the tiny bolt.

Ron Dittmer