How often do you change the engine oil for a 1999 Toyota Corolla?
According to the vehicle's owner's manual, the engine oil for the 1999 Toyota Corolla with a 1.8L engine should be changed every 5,000 miles or 6 months, whichever comes first. For vehicles equipped with a 1.6L engine, the oil should be changed every 7,500 miles or 7.5 months, whichever comes first.