T4 is the newer replacement for rotella T... The "T4" blended oil product ( part syn and part reg oil) new name,,, and to helps it line up with the synthetic "T6" (fully synthetic) name.... But I suspect even the T6 is a blend of synthetic oils. T6 oils would be more important if you operate in extremely cold weather or outside "normal design" environments. I personally dont do snow removal, or plant/plow/hay below 32 degrees, so T4 is fine for my 32 to 120 degree days.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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