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What happens if I use synthetic blend instead of full synthetic?

When it comes to engine oil, there are two main types: synthetic blend and full synthetic. While both can be effective in keeping your vehicle running smoothly, there are some key differences to consider when deciding which one to use. In this article, we'll explore what happens if you use a synthetic blend oil instead of a full synthetic oil.


What is Synthetic Blend Oil?


Synthetic blend oil is a mixture of conventional mineral-based oil and synthetic oil. This combination aims to provide some of the benefits of synthetic oil, such as improved performance and protection, while being more affordable than a full synthetic oil. Synthetic blend oils are often recommended for vehicles with higher mileage or those that don't require the highest level of protection.


Differences Between Synthetic Blend and Full Synthetic Oil


The main differences between synthetic blend and full synthetic oil are:



  • Composition: Synthetic blend oil contains a mix of conventional mineral-based oil and synthetic oil, while full synthetic oil is entirely synthetic.

  • Performance: Full synthetic oil generally provides better engine protection, improved fuel efficiency, and longer oil change intervals compared to synthetic blend oil.

  • Cost: Synthetic blend oil is typically less expensive than full synthetic oil.


It's important to note that the specific performance and cost differences can vary depending on the brand and quality of the oil.


What Happens if You Use Synthetic Blend Instead of Full Synthetic?


Using a synthetic blend oil instead of a full synthetic oil may not have a significant impact on your engine's performance, but there are some potential drawbacks to consider:



  • Reduced Engine Protection: Full synthetic oils are designed to provide superior engine protection, particularly in high-performance or high-mileage vehicles. Using a synthetic blend may result in slightly less protection, leading to increased wear and tear on engine components over time.

  • Shorter Oil Change Intervals: Full synthetic oils typically have longer recommended oil change intervals compared to synthetic blends. Using a synthetic blend may require more frequent oil changes to maintain optimal engine performance and protection.

  • Decreased Fuel Efficiency: Full synthetic oils are often formulated to improve fuel efficiency, which can result in slightly better gas mileage. Using a synthetic blend may not provide the same level of fuel efficiency improvements.


It's important to consult your vehicle's owner's manual or a trusted mechanic to determine the recommended oil type and change interval for your specific vehicle. Following the manufacturer's recommendations can help ensure the best performance and longevity for your engine.

What happens if you don't use full synthetic?


As regular oil moves through the vehicle's engine, it degrades slowly thus leaving harmful deposits and even leading to the formation of sludge. It can affect the performance of your car's engine and the life of the vehicle. The synthetic oil comes with minimal impurities and is more sludge-resistant.



Does it hurt to change from synthetic blend to full synthetic?


Yes, it is OK to switch as there are no rules or regulation set to define how much synthetic oil must be in the blended oil.



Will switching oil types harm the engine?


Is it Okay to Run Different Types of Oil? - While consistency is always a good thing, it is perfectly okay to run different types of oil, as long as it's the correct type for your car. The brand name is a matter of preference, but it's good to stick with a high-quality name.



Is it okay to use synthetic blend oil in older cars?


Risks of Using Synthetic Oil in Older Cars
Although newer cars can handle esters with ease, some older vehicles may have seals, gaskets, and plugs that are not as tight as in newer cars. Built-up sludge from the use of conventional oil may be acting as an assist to these seals.



Is it okay to use synthetic blend oil in high mileage cars?


Despite what some drivers may believe, if the need arises, you can mix high-mileage motor oil with the conventional or synthetic variety (or vice versa) in your car's crankcase. However, you'll lose some of the benefits of the high-mileage oil.



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


Myth: Once you switch to synthetic oil, you can never switch back. This is one of the most persistent myths about synthetic oil—and completely untrue. You can switch back and forth at any time. In fact, synthetic blends are simply a mixture of synthetic and conventional oils.



Can I use synthetic blend instead of full synthetic oil?


Synthetic blend oil is different because it uses a mixture of synthetic and conventional based oils. Synthetic blend oil offers less protection than full synthetic oil and needs to be changed more often.



Is it OK to mix semi and fully synthetic oil?


It is not harmful to mix oils, and you don't run the risk of causing a chemical reaction. Some of the synthetics are already a mix of conventional and synthetic, so essentially it is already combined. Even though you can mix the two, most mechanics will not recommend that you do it regularly.



Does full synthetic really matter?


Unlike synthetic blends or conventional oils, fully synthetic oils won't break down and will protect your engine for longer—sometimes as much as 250,000 miles. Cleaner engine. As motor oil circulates through your vehicle's engine, deposits form.



What happens if I use semi-synthetic oil instead of fully synthetic?


The reverse is much worse. Do not add semi-synthetic oil to synthetic as it will increase the degradation rate of the full synthetic. That's because the imperfect nature of hydrocarbon chains in hybrid oils cause pure synthetics to break down faster than they would normally.


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.