This is why I rinse the chassis with water (at the self-serve car wash $2/time)
in the winter whenever temp is above 2-3C.
In April, I wash the chassis with garden hose. Rust accelerates in the hot months of June July Aug.
Don't blame BMW. It is lack of maintenance by the owner.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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