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My Prius has an oil burning problem. Everything I read says it's 95% likely it's the piston rings because the previous owners followed Toyota's yearly oil change recommendation. Have you seen the Car Care Nut's YouTube channel?
Car buyers that upgrade to a brand new car every 3 to 5 years are the main ones who buy new cars. And they like not having to do much to the car. And yearly oil changes don't affect them, it affects the next car owner. Car companies are going to cater to their customers, not those of use that feed off the bottom of the used car chain.
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