Engine oil gradually loses its additive package and its ability to carry heat and debris, even before it looks dirty. That is why the manufacturer's published maintenance schedule uses mileage and time rather than appearance alone. For this model year, the schedule calls for engine oil and oil filter replacement every 10,000 miles.
Signs the service may be due include an oil-change reminder light, mileage past the last service, oil on the dipstick that looks dark or low, or a ticking or louder engine note at startup. Drivers can schedule service with Park Place Lexus Grapevine.
