What do you think will happen when you ignore the manufactures recommendations and use a weight of oil they do not recommend? You will have premature internal engine wear. It may take time but you are causing wear. Use exactly what the manufacture recommends.
The 3.5L needs 10W30. All other engines use 5W20.The 3.5L needs 10W30. All other engines use 5W20.
The 4.0L uses any name brand 10w30. It holds 6 quarts.The 4.0L uses any name brand 10w30. It holds 6 quarts.
The motor needs to be replaced. There is a "switch" in the motor that "parks" the wipers. This happens when current is removed from the motor. Your "switch" in the motor is not allowing this to happen. Replace the motor.
blower motor actuator needs to be replaced.
A person needs a motor when there is a need for mechanical energy with availability of a power source.
3.5L, no. 2.7L, maybe- should be 5w30 5.7L, yes. Needs to be 5w20.
SAE 5W30 or 10W30 I would recommend the SAE 5w30 synthetic blend.
To answer this question the voltage of the motor needs to be stated.
To see if the motor is three phase or single phase look at the motor's nameplate. There it will tell you what the voltage needs to be and what system phase the motor needs to be connected to operate properly.
An electric motor can power anything that needs mechanical torque.
Motor getting tired and needs replacing
The weight is important. Some call for straight 30 , other call for a multiviscosity ie: 10w30. If it is a standard push mower it is probably straight 30. If it is a rider with a oil filter it probably needs 10w30. If you are unsure, reask question with type and size of mower.