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Old 06-24-2020, 12:44 PM   #6 (permalink)
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Originally Posted by EcoCivic View Post
I don't know much about these Prius engines, but bad valve stem seals often cause oil consumption issues and from my experience go bad more than piston rings. The rubber gets hard and cracks with age and no longer seals effectively, allowing oil to get past. The good news is that on a lot of engines replacing the valve stem seals isn't a big deal and can easily be a DIY job depending on the tools you have and your mechanical skills.
It's a known piston ring issue on the 3rd gen Prius. Toyota issued a TSB a few years ago; the fix is replacement of the pistons and rings to the updated MY 2015 version. But it only applies once consumption reaches 1 quart/1,300 miles for vehicles in-warranty.

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