Mixing Synthetic 5W-20 and Conventional 5W-20: A Comprehensive Guide
One of the frequent questions in the world of automotive maintenance is whether it is safe to mix synthetic 5W-20 and conventional 5W-20 oils. This article delves into the nuances of oil mixing, the differences between synthetic and conventional oils, and the specific scenarios where mixing may be justified or not.
Introduction to Oil Types and Mixing
When it comes to engine oils, there are typically three main types: synthetic, conventional, and semi-synthetic. Each type has its own set of advantages and applications. Synthetic oils are renowned for their superior performance, durability, and ability to protect engines under extreme conditions. However, they come at a higher price point compared to conventional oils, which are primarily made from natural crude oil and refined to meet specific performance standards.
Why Not Mix Different Types?
When faced with the necessity of mixing oils due to a shortage, it’s essential to understand the potential downsides. Experts advise against mixing different types of oils because it can dilute the performance benefits of the higher-grade synthetic oil. While it is technically possible to mix synthetic and conventional oils, doing so does not offer any significant advantages over using high-quality synthetic oil alone. In fact, it can potentially lead to suboptimal engine performance and accelerated wear.
Understanding the 5W-20 Specification
The viscosity grade of an oil, such as 5W-20, refers to the range of its slipperiness over a given temperature. This specification is crucial for ensuring that the oil performs optimally across a wide range of operating conditions. Some key components beyond the viscosity grade, such as additives, address a range of other performance aspects, including cleaning, dispersing contaminants, reducing friction, and improving overall engine health. Mixing a litre of synthetic 5W-20 with conventional oil can create a semi-synthetic oil, but this might not provide the same level of protection as pure synthetic oil.
Compatibility and Vehicle Age Considerations
It’s important to consider the age and design of the vehicle when deciding whether to mix oils. Older vehicles, particularly those manufactured before the 1990s, may experience compatibility issues with synthetic oils. These engines are not always designed to handle the higher quality of synthetic oils, which can result in seal integrity issues and potential engine damage. On the other hand, modern vehicles often require only synthetic oils to ensure peak performance and longevity. Mixing could lead to premature wear of critical parts, especially in engines that exclusively use conventional oil.
Conclusion and Recommendations
In summary, while it is technically possible to mix synthetic and conventional 5W-20 oils, it is generally not recommended due to the dilution of the performance benefits of synthetic oil. Instead, it is advisable to rely on the higher quality of synthetic oil for optimal engine performance and longevity. If the need to mix arises due to an unexpected situation, it’s crucial to acknowledge that the mixture will perform at a level between conventional and synthetic oil, neither providing the robust protection offered by a high-quality synthetic oil nor the budget-friendly alternative of conventional oil.
If you find yourself in a situation where you’re mixing oils, the key takeaway should be to get a full oil change as soon as possible to ensure that your engine is protected. Additionally, it’s worth asking why you don’t have an adequate supply of the correct oil for your vehicle in the first place. Staying prepared with the right oil can save you from these types of situations and ensure your engine remains in top condition.