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This might have advantage with motorcycle engines (compact size) but on car engines its not a problem . With older type that use a saddle caps for main bearings there is plenty of room for air to circulate around, oil pans are larger than level .
With newer , aluminum block that use girdle type main bearing bolting, many do have vent whole right below cylinder bores for air to move around .
Also in general the motorcycle rev's a lot high than a car engine so more whipping of air .
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