Some 30+ years ago, one of the major motorcycle magazines (maybe Cycle World, Cycle, Motorcyclist. or the equivalent) did and interesting research project. They took a pair of brand new Kawasaki 4-stroke four cylinder street bikes and drove them hard for something like 30,000 miles (guessing at that mileage), but these guys put their test bikes through their paces. One they did the regularly factory recommended and scheduled oil & filter changes. The second bike they did nothing to as far as oil/filter changes. Both had done to them whatever repairs popped up from time to time (eg. broken cable, maybe valve adjustments, etc), and of course, oil was topped up as necessary to keep the oil level correct. After the driving part was over, they tore down both engines and measured all clearances accurately. The conclusion was that there was no noticeable difference in engine wear between the two engines. I wish I could find a link to that article. To be honest, I think all this stuff with "I'll only buy brand X but never buy brand Y" is a bunch of hog wash. As long as the oil meets the specs for your engine, I really don't believe it makes a lot of difference.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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