Why Synthetic Motor Oil Might Not Be Best for Older Cars' Engines
Introduction
When it comes to automotive maintenance, choosing the right motor oil is a crucial decision. Many enthusiasts gravitate towards synthetic motor oil due to its numerous positive attributes. However, for older car engines, the choice of oil can be more nuanced. In this article, we will explore whether synthetic motor oil has a negative impact on the performance of older engines, and provide a balanced view based on real-world experience and expert insights.
Understanding the Differences
It is widely accepted that older car engines have larger tolerances and require thicker oils compared to modern engines. Thicker oils are better at providing lubrication and protecting against wear, especially in engines with worn-out parts. On the other hand, many synthetic oils are known for their thin viscosity, which can be as low as 0W/20. This low viscosity can be too thin for older engines when cold and too thick when hot, leading to potential performance issues.
Impact on Older Engines
In some cases, if not all seals are pliable, synthetic oil might seep past hardened seals, leading to oil consumption and potential leaks. This is particularly problematic in high-mileage engines with increased ring clearance, where the increased oil consumption can be detrimental to overall engine health. While synthetic oils can enhance sealing and prevent leakage, the thinner consistency can make it difficult for older vehicles to maintain proper lubrication and protection.
Contrasting Opinions and Real-World Experience
From an expert perspective, synthetic motor oil is often considered superior to mineral oil due to its enhanced performance characteristics. It offers better protection against thermal breakdown and can enhance seal integrity. However, the cost and suitability of synthetic oils for older vehicles are often debated. Some argue that it may be overkill, given that mineral oils with a viscosity around 20W/50 can serve older engines well without the added expense of synthetic oils.
A fervent advocate of synthetic oils suggests that they are the best and lowest cost investment, regardless of the vehicle's age. This perspective is based on experience; one individual has used synthetic oil in a 75,000-mile engine with no ill effects, extending the engine's operational life by an additional 9,000 miles. This suggests that synthetic oil can indeed be effective and beneficial for older engines.
Conclusion and Recommendation
In conclusion, while synthetic oils offer numerous benefits, including superior lubrication and protection against thermal breakdown, their suitability for older car engines depends on the specific needs of the vehicle. Thinner oils might not be ideal for engines with larger tolerances and worn-out parts. For those with specific concerns, it is essential to consider the engine's condition and consult with a professional mechanic before making a decision.
Ultimately, the choice of motor oil should be a balanced decision based on the vehicle's age, maintenance history, and the expert's opinion. Whether synthetic or mineral oil, the key is to choose the right viscosity that provides adequate protection and lubrication for the engine.