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engine on 1999 Isuzu VehiCROSS

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My suv just started making a knocking noise as you increase the gas pedal,it's heard mostly when sitting inside the vehicle.I checked the engine's dip stick and saw no oil then I added 1quart suddenly it was full?? What can this be?
(2) Answers
Your vehicle is burning oil, has an external oil leak or the oil level was never topped up correctly after the last oil change.