What is the correct grade of oil for a 1998 2.4L Malibu?
More than likely 10w30. Check your owners manual or call a Chevy
dealer to be sure. Sometimes it is written on the oil cap. The
factory specifies 5w30..in cold climates it helps the oil to flow
better. In warm or hot weather 10w30 is acceptable..but under NO
conditions should the 2.4 engine use any thicker oil..thicker would
be 10w40.. 20w50 etc.