Is It Harmful for a Car's Engine to Frequently Stop and Start?

Many myths circulate around the impact of a car's engine's frequent stop and start. While there are certain conditions under which starting and shutting off the engine repeatedly can be harmful, modern technology has introduced features designed to mitigate these issues. This article delves into the details of engine wear, the impact of frequent stop and start on the engine and starter, and whether the benefits of automatic stop/start outweigh the drawbacks.

Engine Wear and Start/Stop Systems

Engine wear is a concern, especially when considering repeated cold starts. When the engine is cold, the lubricating oil does not flow as well, leading to increased friction and wear on moving parts. However, modern cars, such as the 2017 Buick Encore, are equipped with heavy-duty starters and automatic stop/start systems to address this issue.

The automatic stop/start system engages after the engine has had sufficient time to warm up. This is crucial because cold engine starts significantly increase wear due to insufficient lubrication. While the engine wear is real, the design of the modern starter motor is built to handle repeated starts, making this system more practical for everyday use.

Start/Stop Systems: A Gimmick or Practical Solution?

Questions often arise about the practicality of automatic start/stop systems and whether they are just a method to boost fuel efficiency on paper. Enthusiasts and professionals have differing opinions. One perspective is that these systems are indeed a gimmick designed to meet artificially inflated fuel economy standards.

While there might be some short-term gas savings, frequent stop/start cycles can have long-term repercussions on the battery, starter motor, and overall system durability. Over time, repeat use of the stop/start feature can result in additional battery wear, requiring frequent replacements and adding to maintenance costs.

The Impact on Engine Health and Parts

Starting a cold engine puts strain on several parts of the car. When the engine is cold, it takes a few seconds for oil pressure to build up, during which time the parts are not fully lubricated. This leads to increased wear.

Conversely, starting a warm engine causes less immediate wear but still results in some wear over time. While both scenarios can cause wear, repeated cold starts are significantly more harmful to the engine over the long term. Oil dilution and condensation build up in the crankcase, impacting the oil's ability to provide effective lubrication, thus contributing to more wear and tear.

Conclusion: Is Frequent Stop/Start Advisable?

Based on the above considerations, it is not advisable to frequently switch off the engine and restart it. This can lead to unnecessary strain on the battery without sufficient charging time, and increased wear on the starter motor. The benefits of fuel efficiency must be balanced against the potential costs and wear on your vehicle.

To ensure long-term engine health, it is best to follow the recommendations provided by the car manufacturer. If you are prone to brief stops or frequent starts, consider driving conditions and the predicted impacts. While automatic stop/start systems are a useful feature for reducing emissions and improving fuel efficiency under certain conditions, their impact on engine health and the overall vehicle longevity should be taken into account.