Specialty tools for a given engine family drive me nuts. Is it really that difficult to design something which works with thousands of preexisting tools? Unfortunately, General Motors didn’t do that with their Ecotec engines’ oil filter caps, which are so common that nearly every mechanic is going to run into one at some point. Ecotecs have an unusual cartridge-style filter design. Instead of a paper filter element contained in a disposable metal casing, there’s an aluminum housing cast into the block which accepts a standalone paper filter, and it’s covered by a plastic cap with unusual artillery-pattern threads and a 32mm male hex on top.
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