Engine oil is used to lubricate, clean, cool, and protect the components of an engine as it runs. You definitely don’t want your pistons and crankshafts to be dried out and grinding up against one another while you’re driving, as that will lead to severe wear and tear and eventual failure. However, putting oil in an engine isn’t as simple as grabbing a random bottle off the garage shelf, pouring the contents into any hole in the engine, and
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