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Based upon the fuel dilution vs. oil viscosity results of the various oil analyses I have had performed on my wife's GLA250 of both the factory fill oil and subsequent fill of Mobil 1 0W-40 (see them posted in the Engine and Technical Discussion area), the factory fill must certainly be an xW-30.

Probably done to eek out that extra MPG rating, however marginal it may be.
 
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