1. Increased Engine Wear: 10w40 oil is thicker than the recommended 5w20 oil. This increased viscosity can make it harder for the oil to circulate properly and reach all the critical components of the engine. As a result, vital engine parts may not receive adequate lubrication, which can lead to increased wear and tear over time.
2. Reduced Fuel Efficiency: Using a thicker oil like 10w40 can increase the resistance within the engine, causing it to work harder to overcome this resistance. This increased effort translates to reduced fuel efficiency, as more energy is required to operate the engine.
3. Cold Weather Starting Issues: The "W" in 5w20 and 10w40 stands for "winter." The lower the number before the "W," the better the oil's low-temperature fluidity. In this case, 5w20 oil is better suited for cold weather conditions compared to 10w40 oil. Using 10w40 oil in cold temperatures may make it harder for the engine to turn over and start properly.
4. Manufacturer Recommendations: The automaker recommends 5w20 oil for a 2000 Dodge Neon for a reason. This recommendation is based on extensive engineering and testing to ensure optimal engine performance, longevity, and fuel efficiency. Deviating from the manufacturer's recommendation could compromise these factors.
If you've mistakenly put 10w40 oil in your 2000 Dodge Neon, it's advisable to have the oil changed as soon as possible to avoid any potential issues. Make sure to use the recommended 5w20 oil or the one specified in the owner's manual for your vehicle.
