We are way over-killing this subject Rich, but the beauty of 75W90 is that it is a synthetic and flows quite good at low temperatures. The SAE 75W90 oil designation is misleading because you can't directly compare it to the commonly known engine oil SAE weight labels. For example in the cold room where we did cold start development this stuff would flow at -25 degrees F. In contrast, 30W engine oil was similar to a high viscosity rubber at these low temperatures. SAE 80W90 is not the same animal, and it is even worse than the 30W engine oil. However this comes at a high cost, 75W90 is nearly $10/quart.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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