Never put lube into sliders. There are certain products that can be used but wrong types will tend to ruin slider. They are carbon tracks and should look after thierselves within reason. Perhaps others could comment on actual serice life of slider, they seem pretty hardwearing to me.
I am surprised no body posts how you actually calibrate pitch on a Technics 1200. You need a ohm meter, a frequency counter and the service manual.
Avoid advice from brain donors (on other forums!)of randomly twisting pots etc to 'make em go fast innit'
A gold star goes to first to post link to genuine service manual, I have such on paper.
Using such should bring all you decks to same spec once the new ones have settled.