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That's a long drain interval. Definitely not disputing the quality of oil, simply saying I prefer better oil than generic oil. There's definitely proven data on shearing, breakdown, etc on things like tranny oil. Found some interesting data sheets and am a big fan of bobistheoilguy website which has good info. But I know there are some cars out there that actually recommend from the factory 15,000 mile intervals on oil changes, so depending on the oil, quality, and vehicle and engineering involved, it would not surprise me the least.
But on reusing oil, I just am not sure how i'd feel about that. Most all my car engines at this point are above the 100k mark, but they're all running quite soundly.
But I do see your point. I've been half tempted to send in a sample of tranny fluid to confirm the data i've found to see if i can validate or not. Even amsoil has some interesting thoughts on the subject, they even recommend you go longer on their products and extend the intervals.
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