wrong oil

[ony]

I have got a old 1990 or older john deere 185 hydro trans lawn mower, it got to where the thing would not pull its self. its so old it don't have a trans filter. I changed the trans fluid good old f type red after it got warmed up same thing . got to looking on the jd sights ;[it had the wrong fluid in it] jd recominds 20-50 in the older hydrostatic drive units, puts some Valvoline 20-50 in it like a new trans know, good reverse and every thing. it had red fluid in it when I got it so that is what I put in it to start with.poor older man gave it to me he said it worked good below 55 degrezz ps it 85 here and I have run it for 1.5 hours still working good