Five objections to the Harvard criteria were raised. 16 The first was that brain death was not followed by disruption of the integrity and coordination of the living organism. The second was that the criteria of brain death could not pinpoint the exact moment on the death time line when death occurs.
For years, car manufacturers and service stations recommended changing your car's oil every 3,000 miles (4,828 km). This is no longer the standard in most cases, however, and many people consider changing a car's oil that frequently to be wasteful and unnecessarily costly.
Your vehicleâs owners manual will tell you how often you need to change your oil. If you drive a newer model, the car may just tell you when you need to change your oil.