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No, I use 0W-40. For an M113, I want the oil as close to 14 cSt as I can get it (and here's they key) - at all times. I know when cold, the oil will be quite a bit thicker than 14 cSt, but 78 cSt at 40°C (which is what 0W-40 is), is much better than 100+ cSt (which is what 5W-40 is) at the same temperature.
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