While the physical properties of the oils are compatible, the performance advantages are lost when they are combined. When you mix the two, you dilute the sophisticated additive package and uniform molecular structure of the synthetic oil with the less refined, more volatile molecules of conventional oil.
Understanding Mixing Synthetic and Regular Oil for Change
Sticking to a single brand and formula within the recommended viscosity prevents the chemical conflicts that arise from blending different base stocks. The primary goal of using a synthetic blend is to extend change intervals and provide superior protection; mixing them negates these advantages.
Manufacturer Recommendations and Warranty Before considering mixing oils, it is essential to consult your vehicle’s owner manual. Even if your engine is designed for a synthetic blend, the manufacturer has already calculated the optimal chemistry for that specific formula.
Mixing Synthetic and Regular Oil: What Happens and Why to Avoid It
Synthetic oils are formulated with specific viscosity index improvers and anti-wear additives that work optimally within a precise chemical environment. Manufacturers specify the exact API service category and viscosity grade required for your engine.
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