Jean's Coffee Ice Cream Pie

18 crushed Oreo cookies
1 square unsweetened chocolate
1/2 c. oleo, melted
1/2 c. sugar
1 qt. coffee ice cream, softened
1 T. oleo
2/3 c. evaporated milk
1 (8 oz.) tub Cool Whip

Mix Oreo cookies and oleo. Press into pie plate. Bake at 375 degrees for 8 minutes. Cool. Add ice cream to pie plate. Put Cool Whip over pie. Freeze. Combine last four ingredients. Cook until thick. Pour over pie. Freeze.