The conventional oil in the mixture will degrade faster than the synthetic component, leading to a drop in overall oil life and performance. The goal of using synthetic oil is to extend service intervals; mixing defeats this purpose.
Mixing Synthetic and Normal Oil: What Happens and Performance Impact
The result is a blend that may perform adequately in mild conditions but could break down or become too thick in extreme temperatures, compromising the oil film that prevents metal-to-metal contact. Most manufacturers explicitly state that while mixing is not prohibited, it is not advised because it prevents the engine from achieving the optimal level of protection and efficiency designed during the testing phase.
Performance and Additive Interaction Synthetic oils are formulated with specific additive packages designed to work in harmony with the engineered base stock. However, this should be seen as a temporary fix until a full synthetic change can be performed.
Mixing Synthetic and Normal Oil: Additive Interaction and Performance Impact
Drivers often find themselves questioning the validity of mixing synthetic oil with conventional motor oil, especially when topping off between changes or trying to make an old engine last a little longer. These additives manage heat, prevent sludge, and reduce wear.
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