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I am having a tough time getting the 75-140 synthetic gear oil, but there are plenty of 85-140 conventional oils available. Does it matter if I use a heavier wieght oil, I tow alot in the summer heat. Thanks in advance.
i prefer to use an example for emphasis on my point. The main gear box on our 4 row potato digger would get so hot the paint would literally burn with 90-140 conventional. After installing synthetic 90-120 it would still get quite warm but you could keep your hand on it. Now you can draw your own conclussions, hope this is helpful
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