There are a few different kinds of combustion engines out there. Most of them are fairly simple machines in theory, but decades of refinement and innovation have made modern engines into complex ...
The numbers and letters on a bottle of motor oil can look like gibberish if you aren't sure how to decode them. 5W-30, 10W-40, 0W-20... What's this supposed to be telling you? Does the "W" stand for ...
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