Fixing a Motor Running Bad After Adding Regular Oil to Synthetic Oil

Many car enthusiasts and drivers may encounter unexpected issues when mixing different types of motor oils. This is particularly problematic when they decide to top up with regular oil after swapping to synthetic oil. This article will explore the reasons behind such issues, provide troubleshooting steps, and offer effective solutions to ensure your motor runs as smoothly as before.

Understanding Synthetic and Regular Oil

When it comes to motor oil, understanding the difference between synthetic and regular oil is crucial. Synthetic oils like 0W-20 and 5W-30 are specially designed to offer better protection and performance under extreme conditions. However, in many cases, a regular, non-synthetic oil can be used to achieve the same viscosity and protection, albeit with a shorter lifespan.

For instance, until a few years ago, a full synthetic 0W-20 was not available, and now even semi-synthetic oils can be found. Regular motor oils are formulated to provide similar protection and performance, but they do not last as long or stand up to extreme conditions as well as synthetic oils.

Causes of Motor Issues After Mixing Oils

Mixing regular oil with synthetic oil can lead to various problems, including:

Living conditions changes: Synthetic oils offer superior lubrication and protection, but mixing them with regular oils can introduce different additives and compositions, potentially causing issues. Loss of protection: Regular oils may not provide the same level of protection as synthetic oils, especially in extreme conditions or high-wear areas. Contamination: Mixing oils can lead to contamination, affecting the engine's performance and health.

Even a small amount of regular oil can cause significant changes in the engine's operation. This is because the different additives in regular oil can interact negatively with the synthetic oil, leading to poor engine performance.

Steps to Fix the Motor

Here are the steps you can take to fix a motor running bad after adding regular oil to synthetic oil:

1. Drain the Old Oil and Change the Oil Filter

First, fully drain the engine's old oil and replace the oil filter. This will help remove any contaminants and ensure the engine is operating with the correct oil.

2. Flush the System

With all old oil removed, thoroughly flush the engine system with fresh, compatible oil. This can typically be done by driving the car for about 2,000 miles or replacing the oil filter a second time. The goal here is to expel any remaining contaminants and ensure the engine is running with clean oil.

3. Check and Replace Ignition Coils

Another common issue when mixing oils is the failure of ignition coils. These components are crucial for engine performance. Ensure that all ignition coils are functioning properly. In some cases, replacing all the coils may be necessary, as they can fail due to the mixing of oils.

For example, in a vehicle with high-performance engines like my car, which has 8 ignition coils, one for each cylinder, the failure of 3 out of 8 coils caused the engine to run rough. Replacing all 8 coils solved the issue and ensured smooth operation.

4. Address Fuel and Sensor Issues

Sometimes, the issue may not be the oil but the oil or gas mixture. If you suspect water or contaminants in the fuel, add a fuel treatment like Lucas to help address the problem. Follow the instructions carefully to ensure the fuel system is cleansed.

5. Consider Professional Inspection

For an accurate diagnosis, consider taking your car to a machine shop for a thorough engine inspection. They can provide a detailed report and offer repair suggestions that can save you both time and money.

Take this information home and implement the necessary repairs yourself, or if you prefer, seek professional help to minimize costs.

Many shops charge around $153 per hour for labor, compared to about $2,000 for the same work. The choice is yours, and depending on your financial situation, the costs will vary.

Conclusion

The running issues after mixing regular oil with synthetic oil can be resolved, but it takes some effort and attention. By following the steps mentioned in this article, you can get your engine back to its optimal performance. Remember, regular maintenance is key to avoiding such issues and ensuring your vehicle's longevity.

God bless!