I would be more concerned with mixing brands than whose name is on the bottle. If an oil is marketed as meeting specifications, then it must meet those specifications or the marketer can be in for some really big fines and liability. My biggest concern is mixing brands in an engine. Each oil is formulated with the basic lubricant and then additives are put in. Some are for friction modification, others for things like anti-foaming, anti-corrosion, and the like. Especially with name brand oils, these additives are proprietary - as in corporate secrets. I see the possibility of getting an adverse reaction between additives from different brands that could result in engine damage.
Transmission oil has become specific to the transmission that it will be used in. There must be 10 or more different fluids now for the different transmissions. Back in the old days, there were only 2 different fluids - type A and type F. Ford transmissions took type F and all the rest took type A. The reason was the composition of the clutch and band friction linings. Using the wrong oil would result in slippage, harsh shifting, or early failure. Now, as each manufacturer evolves and refines their transmissions, they are calling for specific characteristics in the fluids they use. Those specs to not necessarily agree from manufacturer to manufacturer. The days of one or two fluids covering the majority of applications is over with.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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