It all depends on the program or schedule you set up for oil changes. New vehicles today the computer counts the engine hours, idle times, total rpms and wheel rpms, how many times it's been started what the temp was then calculates the percentage of oil life left. 35 yrs ago they told us in school that oil does not break down it just becomes contaminated from the burning of the fuel and what ever is sucked in thru the air filter(s). I change my personal car and truck oils every 3k miles.
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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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