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When it comes to maintaining a high mileage engine, the idea of switching to a thicker oil is certainly worth considering but should be approached with nuance. High mileage engines often develop increased clearances between moving components due to wear and tear, and thicker oil can help maintain a more substantial lubricating film that might reduce metal-to-metal contact, thereby potentially minimizing additional wear. This thicker film can act as a cushioning layer, improving protection during operation, especially under higher loads or temperatures.

However, the benefits of thicker oil come with trade-offs. Higher viscosity oils typically flow less readily, especially during cold starts, which can lead to delayed lubrication timing and increased initial wear. This could be particularly problematic in older engines with tighter clearances or colder climates. Additionally, thicker oils can increase oil pressure, which might strain aging seals and gaskets, potentially causing leaks. While some users report that thicker oil can reduce leaks by providing a better seal, others find that increased pressure may worsen the issue if seals are brittle or compromised.

Another important aspect to consider is engine cleanliness. Thicker oils sometimes contain additives targeted at high mileage engines, including detergents and conditioners that help reduce sludge buildup and maintain cleanliness. Still, if the oil does not flow well enough to properly circulate and carry contaminants to the filter, it might inadvertently contribute to sludge accumulation.

Ultimately, the key is balancing sufficient film strength to protect worn components without compromising oil flow and engine efficiency. Often, consulting the manufacturer’s recommendations or seeking oils specifically formulated for high mileage engines provides the best compromise. Regular oil changes and proper engine maintenance remain crucial, regardless of oil viscosity choice, to ensure long-term engine health.