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Motor oil has many important functions beyond just controlling friction and wear. Oil not only lubricates the engine's internal parts, but also helps cool the bearings and other frictional surfaces. The oil in the engine, therefore, serves as a heat sink to gather up unwanted heat to transfer it by conduction or convection out of the engine. Under typical driving conditions, running a quart or two low may not make much difference in terms of bearing temperature or overall engine lubrication. So I think you should be fine.
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