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IMO that's why oils are such a hotly debated subject, it's virtually impossible for the average user to quantify the gain in service life. Though I think the benefits of synthetic oils are well proven. I've run 2 cars on Mobil 1, one with oil changes @ <5K miles, and a beater @ 10K miles, both are running fine with 190K miles and the valve-trains look great. No internal engine problems. Extreme usage, or problematic engines may show different results.
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