Imagine standing in front of an aisle with two bottles of oil looking down at you. Both of them claim to meet the same standards. The only difference is that one is a run-of-the-mill store brand while the other bears the name of a reputable company. As with many other products, you end up wondering whether you are shelling out the extra cash just for the logo.
Unlike light bulbs or paper towels, engine oil has quality differences that might not be apparent at first glance. However, after a few months or years, the gap starts to show. Motor oil isn't a one-size-fits-all mix of base oil and additives, and formulations can vary — sometimes by a lot.
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