Moly grease was dissolved in laquer thinner and then squirted on the top and lower bearings. I also replaced the motor brushes with generic starter brushes which I sanded down to exact size.

Total cost = $2.00 or so for the brushes at a local starter alternator repair shop. My labor = ?? took several hours since I was in new territory. You could search for my post (DanielW) when I did my older 87 300E (124 bodied) car. The hardest part was removing the wiper assembly and trim around windshield.

Luck to you,
DanielW