Can You Use Synthetic Oil in an Old Car? Potential Benefits and Considerations

Using synthetic oil in an older vehicle can be a topic of debate among car enthusiasts. While some argue that synthetic oil can cause harm, others believe it may offer benefits when used properly. This article explores the potential advantages and considerations when switching to synthetic oil in an older car.

Introduction to Synthetic Oil

Firstly, it's important to understand that synthetic oil has certain properties that conventional oil does not. Synthetic oil is engineered to provide superior performance, particularly under extreme conditions. However, its suitability for older cars might differ from what is expected for modern vehicles. Let's dive into the specifics.

Potential Benefits of Using Synthetic Oil in Old Cars

Improved Engine Protection

Many classic and vintage cars were designed to operate with lower viscosity and detergent oils, which can degrade over time. Synthetic oils, known for their superior viscometrics and detergent properties, might offer enhanced protection for these older engines. This is particularly true for classic vintage cars with phenolic gears or other components that can be damaged by modern oils.

Enhanced Oxidation Resistance

Synthetic base stocks have excellent oxidation resistance, which means they can last longer without breaking down or forming sludge. This is crucial for maintaining the integrity of an older car's engine. Additionally, synthetic oils often contain cosolvents that help keep the additives in suspension, ensuring that the oil remains effective over a longer period.

Considerations for Using Synthetic Oil in Old Cars

Compatibility with Engine Components

Not all old cars are created equal. Some, such as classic vintage cars with phenolic gears, should not use synthetic or modern conventional oils as they can be dissolved by these types of oils. For these vehicles, it's best to stick with conventional oils with the appropriate viscosity.

Proper Viscosity

For older cars that are in good condition and have been well-maintained, switching to a synthetic oil can be a viable option. However, it's crucial to choose the right viscosity. High-mileage synthetic oils with cosolvents are recommended as they can help maintain the life of seals and gaskets and extend the draining interval.

Best Practices for Switching to Synthetic Oil

Proper Application

Simply pour the synthetic oil into the designated spot in the engine crankcase without mixing it with existing oil. If you're switching from a conventional oil, don't mix the two as it can cause damage. For better results, it might be advisable to use Delo diesel engine oil and a new Wix filter.

Initial Oil Change

For the first oil change, it's recommended to use a lower weight oil, such as a 30 or 40 weight, for the first two weeks or 1,000 miles. After that, a full oil change is necessary to remove any contaminants and ensure the oil is working optimally.

Conclusion

While synthetic oil can offer benefits for older cars, it's not a one-size-fits-all solution. Proper research and knowledge of your car's specific needs are essential. For modern flat-tappet engines, a good diesel oil with zinc additives is often recommended due to the metallurgy and technology used in older engines. Always consult a professional or refer to your vehicle's manual to ensure the best approach for your car.

Keywords: synthetic oil, old car, viscosity