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Just (not verified)    July 23, 2024 - 11:48PM

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There are plenty of good synthetic oils that are lab-confirmed to resist more shear than any standard engine will generate, at well in excess of 10k miles. This is a proven fact, not an opinion. Changing oil based on time is even more unnecessary, and this isn't even controversial anymore. Lab tests have shown 5+ year old oil performs as good as new. I guess if you tell customers any of this you can't sell them an oil change though.

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