Does the 2021 Avalon still have oil emulsification issues?

[LaMiles]

No. Currently, the oil dilution issue with the Avalon is entirely concentrated in the 2019 model year, and the latest 2021 Avalon does not have this problem. Below is some information about the 2021 Avalon: 1. Performance: This vehicle is equipped with an imported Aisin 8-speed automatic transmission with manual mode, featuring four driving modes: Eco, Normal, Sport, and Sport+. The quality is relatively stable with no common issues. 2. Cause of emulsification: The main reason for oil emulsification is that during winter, atomized fuel sprayed by the injectors comes into contact with the colder cylinder walls, leading to wet wall phenomenon. When this occurs, gasoline flows into the oil pan and mixes with the engine oil, causing emulsification over time. This issue has now been completely resolved.

[EmmaFitz]

I drive a 2021 Avalon Hybrid, and my biggest concern when purchasing was the oil emulsification issue, as earlier models were prone to this problem in cold weather, with milky white substances appearing inside the oil cap being a common symptom. Toyota made upgrades to both software and hardware after 2020, such as optimizing engine design to reduce moisture condensation. Having driven for over two years, mainly in northeastern winters, I haven’t encountered any emulsification. However, as a precaution, I regularly open the hood to check the oil condition and recommend owners develop a habit of performing a simple monthly self-check, like unscrewing the oil cap to see if the color looks normal. Overall, the 2021 model shows significant improvement over older versions, with enhanced reliability. But if you frequently take short trips or live in high-humidity areas, it’s better to pay extra attention to maintenance to prevent minor issues from becoming major problems.

[DeHazel]

As someone fascinated by automotive technology, I've analyzed the oil emulsification issue in the 2021 Avalon. Emulsification refers to the mixing of moisture with engine oil, forming a milky substance, primarily occurring in older hybrid systems due to frequent short-distance driving that prevents the engine from reaching optimal temperature. Toyota had already released ECU updates and mechanical improvements before the 2021 model, such as optimizing coolant circulation. According to my research, the occurrence rate of this issue is much lower in newer versions. Users can monitor oil color changes themselves or use an OBD tool to read engine fault codes; if concerned, a professional system inspection at a service center offers peace of mind. Overall, the 2021 model has seen enhancements in design and maintenance, but daily habits like avoiding low-speed short trips are crucial.

[StDakota]

From my maintenance experience, checking for oil emulsification in the 2021 Avalon is quite straightforward. Signs of emulsification typically occur in cold and humid conditions, where white residue can be seen when unscrewing the oil filler cap. After Toyota addressed the issue through recalls and updates, newer models have seen significantly fewer problems. I recommend owners check their engine oil every three months or 5,000 kilometers; for hybrid versions, taking longer drives in winter to fully warm up the engine is beneficial. Most 2021 Avalon owners report that the issue has been mitigated and it hardly affects daily use. Maintaining regular servicing and using qualified engine oil can greatly reduce the risk.