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回答: What's the purpose of the "hole" at Oil Filter Base? 由 zhangd 于 2016-02-02 18:30 There are many theories: theory 1: a depression to collect sediment or residual oil when changing. this depression keeps stuff from falling of flowing into the engine when you take the filter off. theory 2: it's just something from the casting/machining i.e. to make it so a machine can handle the part or something like that. theory 3: subaru's future high end car has a sensor inside this depression so that it can detect oil leak :] | |||
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