Buick Lesabre Starter Replace/Remove

My Starter Makes A Whining Noise When It Cranks.the Mechanic Has Put 4 New Starters And 2 New Flywheels. I Then Had The Old Starter Rebuilt...

Starter Motor Rotates But Is Not Engaging With The Engine. What Is The Cause For This?

Intermittent Problem With Starter Engagement Circuit Starter Tested On Bench Ok Voltage Good On Wire To Solenoid When Starter Engages Do I...