Sure WD-40 will penetrate somewhat, but there are certainly better penetrating products out there. Yeah, it's better than nothing, and I have used it as a penetrating oil when it was the quickest or easiest available, but given a choice, it's way down the line. The best use, or success, I have had with it is on a Howard Miller wall clock we have had for about 30 years. It stopped running about 10-12 years ago... I packed paper towels in and around everything I could think of to soak up any oil before it got where I didn't want it. I flushed the works with WD--40, let it wick out as much as possible, and it's been running ever since.
If it's all you've got, by all means use it... as I said, it's "about" worthless, not toally worthless.
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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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