I used to be a professional certified auto mechanic for 27 years and I always used the 3k method but now I go by the computer which is almost twice as long. The reason is (and this is with cars I've owned since new) that the oil I was draining at 3k was looking almost as clean as when I put it in. I'm presuming oil improvements over the last half century. I just bought a new car and the owners manual says to strictly use 5W-20, no thicker. That's sewing machine oil!
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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