john deere 80w140 its full synthetic and cost the same as other synthetic. 1 quart is plenty. make sure you clean the vent on top off the gear case about 14$$ a quart
they show a wide range of oil weights the 80w 140 has a little higher temp range then the 80w90. but thats probally different now with the synthetics
just make sure its a GL-5 rating
if your mowing 20 acres in 100 degree temps i would use the 80w140 for sure but if not the 80w90 should be fine:greentractorride:
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