I know in the semi synthetic would shift and roll easier in cold weather like near or below zero. Rolling ease has a lot to do with shifting and shifting has a lot to do with ease of movement taking off and getting up to speed. With regular 80/90 in the rearends and 50in the trans it would tend to drag down faster till it warmed up. With synthetic in the rearends 75/90 and synthetic 50 in the trans it would not drag much to take off with it cold. I also have to believe it had to lubricate better in cold weather if it flowed that much easier. The truck now has 1,150,000 on the rearends and transmission now and is still in use on the farm pulling more weight and in more difficult conditions than it ever did on the road. Some times in the 100,000 range to the bin. 85,000 to the elevator 6 axles. I'm not pitching for synthetic nor do I use it other than in those places. I will also if needed put it in other gear boxes if I'm out of regular gear oil. After all a cup is not going to cost that much more in an auger gear box.
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