To avoid contact corrosion, use only genuine Audi parts (bolts and attachments). Damage resulting from contact corrosion is not covered by the warranty. box gears with a magnesium crankcase can be recognized by the inscription «Mg Al 9 Zn 1», located on the left side of the box.
A gearbox with a magnesium crankcase is indicated by the inscription «Mg Al 9 Zn 1», the arrows show the location of this inscription
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