[Zax40]

If it were me I would get out all the old I can and then fill it with corn head grease. I usually jack up the front so the tires are off the ground. After the first top off of corn head I slowly turn the wheel stop to stop. Then I top off again. Repeat until turning the wheel does not drop the level below the fill hole

Maybe a small squeeze bottle with a rubber hose attached could be used to suck more of the old out