Like the oil in a car, electric motors need the right kind of lubricant to function properly. However, problems with the wrong lubrication happen quite frequently. Improper lubrication is responsible for up to 80% of all motor bearing failures. The right lubricant should be carefully selected for the motor based on the motor’s age and operating conditions. Along with using the wrong type of lubricant, subjecting the motor to temperatures and conditions outside the suggested operating range can cause the lubricant to degrade quickly than normal. Discolored rolling elements, excessive bearing wear, and overheating indicate lubrication problems.