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Can it hurt your engine if they put synthetic oil in it?

It is highly unlikely that putting synthetic oil in an engine designed for conventional oil will hurt your engine. Here's why:

* Synthetic oil is superior: Synthetic oil is engineered to outperform conventional oil in many ways, including:

* Better high-temperature performance: Synthetic oil can withstand higher temperatures, reducing wear and tear on your engine.

* Longer lifespan: Synthetic oil lasts longer than conventional oil, meaning you can go longer between oil changes.

* Improved fuel efficiency: Some synthetic oils can even improve fuel efficiency.

* Compatibility: Modern engines are designed to handle a wide range of oil types, including both synthetic and conventional.

* No harm in mixing: There's no need to flush your engine if you're switching from conventional to synthetic. You can safely mix the two.

However, there are a few things to keep in mind:

* Check your owner's manual: Always consult your car's owner's manual for the recommended oil type and viscosity. Some manufacturers may specifically recommend using a certain type of oil.

* Older engines: If you have a very old car, using synthetic oil might not be necessary and could potentially lead to leaks. This is because synthetic oil is thinner and can sometimes seep through older seals.

In conclusion, using synthetic oil in an engine designed for conventional oil is generally safe and can actually benefit your engine. However, it's always best to check your owner's manual for specific recommendations.