Well here it is right from Baldor.
https://www.baldor.com/mvc/DownloadCenter/Files/LB5001
Karl's 213T frame motor should be greased every 3600 hours of run time. If my math is right and he runs the saw 4 hrs. a day for 365 days a year he should put 4 teaspoons of grease in the bearings every 2.46 years. Do it wrong and risk ruining the bearings.
I still don't think I'd bother getting the Polyrex EM to use 8 teaspoons of grease every two and a half years. I've seen 20 HP, 3600 RPM Baldor motors run under a heavy load on a Wheelabrator shot blaster for 18 hours a day never get greased and 5 years later they are running just fine.
Confidence: The feeling you experience before you fully understand the situation