Sorry if the wrong forum... car: 2014 Honda Civic EX-L, 1.8L engine, still on original break-in oil When I hit 6,000 miles on my car this morning, the moment it hit that it also went from 50% to 40% on the oil life. I thought that there was some magical sensor in the engine that actually "looked" at the oil and determined when it was getting dirty. My neighbor is a certified Honda mechanic and he recommends folks not go by that indicator. He recommends 5K OCI on synthetic and 3K OCI on dino oil. Does anyone know exactly how that oil life sensor really works?