14 October 2015

Public Service Announcement: Mirror Screw Corrosion

Years ago it became evident (or so we thought at the time) that the 2 screws that hold the exterior mirrors on can become corroded.  Some owner’s even reported losing a mirror.  The corrosion happens because water sits in the recesses of the mirror base after washing or heavy rain.  I replaced the screws on this car with new stainless steel ones from McMaster Carr.  

Now, all that said, the original BMW screws on my 16-year-old car were fine and showed no evidence of corrosion at all.  But, My S54 has these stainless screws and it's better to be safe than sorry.

Type 316 Stainless Steel Socket Head Cap Screw, M5 Thread, 25mm Length, .8mm Pitch, McMaster Carr, $10.16r/pack 25 (need 4 per car)

BMW screws on the left, McMaster Stainless on the right.

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