This is not true. Reduced Protection: The blended mixture will not last as long between changes as pure synthetic oil.
Can Mix Synthetic Regular Engine: What Happens When You Blend Them
At high temperatures, synthetics resist thinning and maintain a stable viscosity, ensuring consistent lubrication. In these cases, adding a small amount of regular oil to reach the proper volume is acceptable to avoid running critically low.
Perhaps you are on a long road trip and your vehicle requires a top-up, but the only oil available at the service station is conventional. In contrast, synthetic oil is engineered in a laboratory, creating a uniform molecular structure that is significantly more resistant to breakdown.
Can Mix Synthetic Regular Engine: What Happens When You Blend Them
If you are performing a complete replacement, it is highly recommended to drain all traces of the old oil and install the new synthetic type. If you have synthetic in the engine, try to acquire more synthetic for your next change.
More About Can you mix synthetic and regular motor oil
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