What sorts of intervals are recommended for changing engine oil?
The standard criteria for changing engine oil are distance and time. Generally, 3-5,000km or 6 months (whichever is first) is the interval normally used in Japan. Although the actual trend for oil change intervals as specified by the manufacturers is trending towards 10-15,000km plus (or once a year), to really keep an engine consistently working in prime condition people often replace their oil at shorter intervals. Furthermore, for vehicles that have higher power output, turbo cars and diesel cars, or those on severe drive cycles, short change cycles are recommended depending upon conditions of use.
