I like that explanation on oil viscosity . Especially the part about oil shear of multi grade oils at high temp and what it does to the viscosity range. Good reason to have oil samples tested on heavy use engines that hold a lot of oil in the sump. Smaller engines, just dump it. One other thing, you can see how one particular 30 wt oil can be very close to the same viscosity as another 40wt oil if one is on the high side of viscosity range and other is on low. I think a lot of the multi-grade oils on the market fall into that category of just being over or under a line.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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