High quality doesn't mean long lasting. Just like tires. From the research I did the ester oil is derived from alcohol. It breaks down faster than conventional oil. It adheres to the diamond polished parts in our vvel system really well that's why Nissan recommends it. I used it for 20k miles. Each change that I pushed the oil past 4k miles it looked horrible. No I didn't have analysis done on it but after changing oil in all my cars over the years I could tell it was toast. I would run the oil if I was pushing the car harder but it's my daily driver.
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