I remember the cautions on 10w-40 also. Said that the additives required to get that kind of a viscosity span were excessive and that there wasn't enough oil left for proper lubrication.
Course that was then and we are here now. If I can run 5W-40 Rot. T full sin in my Cummins diesel with the blessings of Cummins (I asked them) then things must have changed.
So I don't know what to say. What's the oil worth to you and what's the engine worth? Worth the gamble? Your money, your equipment.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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