I just wanted to know the truth about whether changing oil early is better for the engine. I do 3,750 oci in the Hyundai. That's what the car calls for under severe service. But today I accidently changed out the qsud5w30 at 3000 miles. I noticed how clean the oil looked in the filter and when I checked my notes I realized I did it early. Guess what im asking hear is doesn't brand new oil protect better then oil say at the end of the interval.