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Semi Synthetic and Fully Synthetic Oil

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Making sure your vehicle has the correct oil will improve performance and protect your vehicle from preventable damage. Read more for an explanation of the differences between semi and fully-synthetic oil.

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Prolong the life and improve the fuel economy of your car by choosing the right engine oil.

Oil is an integral part of your engine. It reduces friction, helps manage engine heat and protects against the effects of damaging toxins. Your car's engine oil will be changed as part of your regular car service or Fuel Service Plus. Read on to find out which engine oil offers the best protection and performance for your needs.

Semi synthetic oil or fully synthetic oil?

Synthetic oils are specifically manufactured to provide consistent, superior performance. Their main advantage over mineral oils is that they protect the engine across a far wider range of temperatures - up to an engine's maximum temperature and beyond. They do not have the impurities found in mineral oils or degrade as quickly, and they are thinner, helping to improve fuel efficiency.

Semi synthetic oil

Semi synthetic oils are cheaper than fully synthetic as they are a mixture of synthetic and mineral oil. Engines requiring semi synthetic oil must use at least semi synthetic oil (not mineral oil) but may benefit from upgrading to fully synthetic oil for increased protection and performance.

Fully synthetic oil

As the name suggests, fully synthetic oils are purely synthetic with no mineral oil. They offer the highest levels of performance and are an essential requirement for many modern engines (check your handbook if you're unsure of the requirement for your car).

Fully synthetic oil as standard

Good news - Halfords Autocentres now uses fully synthetic oil as standard. Book a car service today:

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