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Old 05-04-2019, 05:10 PM   #6 (permalink)
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Originally Posted by RedDevil View Post
The vacuum will draw some oil into the cylinder head. Maybe it seeps back into the oil pan when the engine is at rest, otherwise the buildup may cause trouble.
That alone would stop me from trying this on a Prius, since the 2010s and 2011s are already known to be prone to developing oil-burning issues as they age.

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