20w-50: Pennzoil 550045212 vs Mobil 1 96936

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Can anyone comment on the use of these two oils in a hydrostatic lawn tractor transmission? I'm trying to decide which one to buy...
 
I have heard of people using it in the hydrostatic trans . I am using it in my zero turn engine which is a Kawasaki . They now recommend a 50 in the owners manual .
 
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