Hi All , I am new to this site and sure have been enjoying the very informative web pages and pic's I have owned a 1980 (i think) I cant find a year on it but the serial number is B7001-44080 .I am having a problem with what fluid to put in the trans.. The sticker on the trans reads 80w .I had purchased fluid at the kubota dealer and they gave me a lighter fluid which they said was the replacement.. Should I refill it with 80 weight fluid ? Will it hurt the hydraulics ? Thank you so much for any response ..