Under normal circumstances, most gasoline engines should not consume any significant quantity of oil. While the 2nd generation (2004-2009) Toyota Prius uses a hybrid engine, its gasoline motor still requires engine oil for lubrication and cooling. Unfortunately, sometimes excessive oil consumption is a well-known problem on these vehicles.
Oil consumption typically occurs due to internal engine issues. When oil enters the combustion chamber due to problems such as worn piston rings, your motor burns that oil and loses it through the exhaust stream.
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