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That's right, it vents the blowby. I don't believe it cools any though, it's really just to burn up the vapors and avoid venting them to the atmosphere. As I understand it, the exhaust gases, because they are spent gases, very marginally slow down the combustion process and apparently just enough to reduce peak temp and reduce NOX production.
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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold
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