[Biotec]

The motor you showed has roller bearings. It should be a little bit more quit than the original motor. as most of the Were sleeve bearing. 20 weight No detergent oil. the motors easy to tell because they will have a yellow cab at each end by where the mounting bracket is at most people forgot oil and motors in the bearings with some time to get worn and make the motor noisy. If the motors are quiet then you have probably belt wear Pulley worn out, and bearing on the arbor that may need to be check or replaced. Both police at the arbor at the motor do where there are aluminum and do eventually become more noisy also. There’s also the noise of the actual sawblade a self which contributes and the noise if it doesn’t have a shroud around it for dust collection and reduce noise.
good luck.