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time your C1, C2 and/or C3 (or C4, C5  C6 or even C7, for that matter) engine will acquire a coating of dirt, dust, road grime and grease and some parts will become discolored due to oxidation or gasoline/ oil seepage. An hour or two (or three or four or more, if it's really bad) is time well-spent for the improvement you'll see when the job is done. So roll up your sleeves and let's get started.