Typically, motors under 10hp are permanently greased. Don't add more. They will run for many, many years with no additional lube.

Electric motors have a very specific greasing procedure. Do it wrong or add too much and you wreck the motor by filling the windings and stator with grease.

The first thing starts with the right specific grease. Each manufacturer will have a specification for the grease and amount. You have to use what they say, not whatever miscellaneous grease you have laying around.

Next is that the motor has to be hot.

Then, you add a specific weight of grease in grams to each bearing.

Then you pull the grease zerks out and run the motor to let the excess grease weep out under power. It generally takes an hour or two.

Last you reinstall zerks and clean off all the grease.

Do it wrong and you'll blow the seals and contaminate/wreck the bearings.