As long as the volume of oil in the crankcase remains in good condition or not expired and contaminated, is still fit for use. And to determine the feasibility, actually can be done by checking steps.
First, it can be use deep stick. And from this stems can see the color and quality of the oil. If you like chocolate milk, caution. Most likely the oil mixed with water through a crack or leak engine coolant.
Secondly, checks can be done by looking at the quality and viscosity of oil by means of shedding in the white paper. If the color black (after use) or just uneven focus in the middle. It was a sign of quality lubricants has been declining.
Third, make sure the appropriate volume of oil motor oil capacity indicator can be seen in the deep end of the stick. If lacking or outdated or too long, this kind of good oil replaced.
