It holds about 7 or 8 qts so it was ok not ideal but all the parts that need lubed would have been enough at 1/2 full.
You are ok dont even give it a second thought a leak may crop up now its topped off and explain it and it sounds like the rest was taken good care of you are fortunate to have found a 30 year old machine in that good of condition great find! :thumbsup: