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Old 08-14-2017, 08:22 PM   #327
Scooby Newbie
Member#: 446722
Join Date: May 2016
Location: Dayton, OH
2016 Impreza 2.0i
Dark Gray Metallic


Originally Posted by 424wrx View Post
how the hell does your dealer think that a manual transmission has remotely anything to do with motor oil consumption? did you laugh at them after that response?
No, I didn't, because it makes sense. With a CVT, the revs stay low when you aren't on the throttle. In a manual they stay wherever they are when you let off. If you engine break or downshift at all, it creates negative pressure in the combustion chamber during the intake cycle and, in cases with thinner oil like 0w20, can pull oil vapor up into the combustion chamber. Over time, this burns more oil than a CVT that keeps revs as low as possible when you're not heavy on the throttle and almost never engine brakes. The CVT can still burn about 3/4 of a quart between changes and varies from engine to engine. Their explanation makes sense and is consistent with what I have read elsewhere about both Subaru and other manufacturers that use 0w20.
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