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What happens if you put full synthetic instead of synthetic blend?

Putting full synthetic oil instead of a synthetic blend can have several consequences for your vehicle's engine. In general, using a higher-quality oil than recommended by the manufacturer is not harmful, but it may not provide any additional benefits either.


Understanding Synthetic and Synthetic Blend Oils


Synthetic oils are engineered to have superior performance characteristics compared to conventional mineral-based oils. They are typically more resistant to oxidation, maintain their viscosity better at high and low temperatures, and provide better protection against wear and tear. Synthetic blend oils are a mixture of synthetic and conventional mineral-based oils, offering a balance of performance and cost.


The manufacturer of your vehicle recommends a specific oil type, viscosity, and quality level based on the engine's design, operating conditions, and performance requirements. This recommendation is made to ensure optimal engine performance, fuel efficiency, and longevity.


Potential Consequences of Using Full Synthetic Oil



  • No significant performance benefits: Unless your vehicle's manufacturer specifically recommends full synthetic oil, using it instead of a synthetic blend may not provide any noticeable improvements in engine performance, fuel economy, or oil life.

  • Higher cost: Full synthetic oils are generally more expensive than synthetic blends, so the additional cost may not be justified if there are no tangible benefits.

  • Compatibility issues: In some cases, using a different oil type than recommended by the manufacturer can cause compatibility issues with seals, gaskets, or other engine components, potentially leading to leaks or other problems.


It's important to follow the manufacturer's recommendations for oil type and viscosity to ensure your engine operates as intended and to maintain the warranty coverage. If you're unsure about the appropriate oil for your vehicle, consult your owner's manual or speak with a qualified automotive technician.

When should you not use full synthetic oil?


Fully Synthetic oil is mostly only suitable for modern cars of about 15 years old maximum, don't use fully Synthetic oil in a very old engine and most important always use the oil that is recommended in your owner's manual.



Is fully synthetic oil bad for old engines?


Yes, you can run full synthetic oil in older cars, and it can even be beneficial in many cases. Here are some key points to consider: Compatibility: Most older engines can use synthetic oil without issues.



Is full synthetic oil better than blend?


Full synthetic oil contains stronger base components. Which in turn will provide better performance versus a synthetic blend oil. Full synthetic tends to break down slower as well, so you won't have to change your oil as often compared to synthetic blend oil.



Is it bad to go from full synthetic to synthetic blend?


Compatibility: Synthetic blends are designed to be compatible with full synthetic oils, so mixing them generally won't cause any issues.



Can you damage engine with wrong oil?


Reduced engine protection: The wrong oil may not have the same additives, viscosities, or performance characteristics as the oil the manufacturer recommends. Because of the increased wear and strain, this can reduce the engine's lifespan and even damage it.



Does full synthetic really make a difference?


Yes, synthetic oil is better for your engine than conventional oil. Although conventional oil (i.e., mineral oil) can provide adequate lubrication performance, it can't compete with the overall engine performance and protection provided by synthetics.



Why can't you go back to regular oil after full synthetic?


Synthetic oils typically provide better protection than conventional oils, but switching back and forth between full synthetic and conventional oil will not damage the engine. Of course, this depends on the current engine condition and the quality of the conventional oil being used.



Is synthetic blend or full synthetic better?


Full synthetic oil contains stronger base components. Which in turn will provide better performance versus a synthetic blend oil. Full synthetic tends to break down slower as well, so you won't have to change your oil as often compared to synthetic blend oil.



Will synthetic blend hurt my engine?


If you have a vehicle with a high-performance engine, mixing conventional with synthetic might not allow the expensive additives in the synthetic to work the way they should. It won't damage the engine, but it won't help it either.



Will switching oil types harm the engine?


The oil you use does not matter what brand it is. Every time you change a brand, you can literally use a different brand -- and your engine will not suffer any damage.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.