That looks like a Well Tempered Reference Arm mounted on a Classic plinth (there was also a Reference plinth made from Fountainhead solid surface; Google it); nice setup! The fluid in the tonearm cup is thick. I've had mine for over 25 years and never changed it. It needs to be full enough to just cover the top of the horizontal paddle. Easy enough to check this with a small flashlight. More important is the fluid in the bearing cup under the platter. If it's like mine, after removing the belt you can carefully lift the platter off with two hands while pushing down on the center spindle with your thumb and the spindle will slide out of the platter. With the spindle in place
be sure that there is enough fluid in the cup to completely submerge the two top bearing points. BTW, while you're here confirm that the center line between the two top bearing points points back to the motor spindle.
The fluid in the tonearm cup is 100,000 cSt:http://turntable-tuneup.com/silicone-damping-fluid/
The fluid in the bearing cup is replaceable with synthetic motor oil.
After that, your turntable is ready to play an LP but use one you don't care much about one as you still need to do all the alignment adjustments to the tonearm and cartridge:https://www.vinylengine.com/library/well-tempered/arm.shtml
-> Download the manual
Do you have the thin plastic "Arm Protractor" that came with the table? You'll need it or something similar:http://turntable-tuneup.com/cartridge-alignment/https://www.vinylengine.com/cartridge-alignment-protractors.shtml
The belt is another component that might need replacement:http://turntable-tuneup.com/well-tempered/
If you can, post some additional pictures of the platter, motor, base, cartridge and junction box on the rear.