You might want to check each oil port and see what the oil inside looks like. I usually dip in a pipe cleaner. I'm thinking you might want to remove the old oil with a siphon or syringe and replace it. I copied this from the manual because there are so many oil ports.
LUBRICATION
Lubricate regularly by putting 3 to 4 drops of SAE 30 oil into each of the seven oil holes. Locations are:
One on the lifting arm.
Three on the saw head.
Two on the main slide.
One on the main raising lever.