You used to have to keep track of when to change your oil, but some newer cars with oil-life monitors will do it for you, letting you know when it's time to seek service.
'The manufacturer believes enough in those that they're putting the warranty behind them,' Bachelder said. 'It's a better gauge of what the oil has been exposed to than the three-month or 3,000-mile intervals.'
McDonald says oil-life monitors observe things like temperature and engine speed in order to calculate when the oil should be changed. He also adds that its calculations are based on the oil recommended for the engine. That means high-performance synthetic oil won't necessarily result in a longer service interval from the oil-life monitor even though the oil may be able to handle one.
Perhaps the monitor's most important benefit, however, is a simpler one.
'It helps remind people that their oil needs to be changed,' Szemenyei said."
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