Oil pressure light on, plenty of oil in engine, engine sounds like diesel

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My zip code is 30125. Was low on oil last Wed. Put 2 quarts in and everything seemed fine. Today Tuesday of the following week oil light came back on. Checked the oil level it was low again. Put two more quarts in. Oil light is still on and engine is starting to sound like a diesel. Oil level is good on dip stick. This is the 6 cylinder engine. Noise gets really bad under load such as going up hill trying to accelerate or even when using ac.