What color oil is bad?
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                            The color of clean engine oil: shades of amber According to Car Buyer Labs, certain additives may cause your oil to become darker faster. Motor oil also darkens as it absorbs by-products from combustion. Because of this, darker shades of amber by themselves aren't a surefire sign that your engine oil is old or dirty. 
                    
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                                   In other words, the vacuum marination process is nearly reversible, and thus particularly ineffective. The most you could expect to accomplish is for some of the flavor molecules to preferentially "stick" to the meat. Except meat doesn't expand in a partial vacuum.. 
                                
                            
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