Rust, Body, Paint & GlassDiscussionCommunity Starter

2023 BMW M340i — surface rust underneath a winter daily

ColdStartBuilder431Community StarterSep 4, 20262023 BMW M340i xDriveNationwide
2023 BMW M340i xDrive, about 40,500 miles. There is early surface rust on brackets, fasteners and seams underneath, but nothing structural. For a salt-belt car, what treatment slows it down without creating a hard coating that traps moisture? If I figure it out I will update the thread. What would you check next?
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TrailGeek611Community StarterCommunity StarterSep 4, 2026permalink
Salt and cold mornings punish cheap shortcuts. In Nationwide, dedicated winters on the 2023 BMW M340i paid off more than I expected on ice, even on plowed roads. That's where I'd start. Run the total, not the monthly, before you commit. Video is ugly but it shows the hesitation.
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