Lower sill protectors — removal and clips

Tags: #clips · #corrosion · #part-number

Lower sill protectors on the X80 can be removed for cleaning/inspection. Attachment: (1) clips along the sides of the sill — Mazda-compatible replacement clips are available on Ozon; (2) screws underneath the front and rear wheel-arch areas ¹².

What to expect underneath: upon removal, expect accumulated dirt and point/spot rust (oxidation) on the sill surface hidden by the protector — one owner who removed theirs found noticeable grime plus spot corrosion starting. This indicates the sills should be periodically inspected and treated (rust conversion/protective coating) rather than assumed clean just because they're covered ³⁴⁵.

Recommendation: inspect sill protectors periodically for moisture accumulation underneath and clean/treat as needed, rather than leaving them installed indefinitely without a check.

Sill corrosion bubble — a common durability issue on 2019+ models (sand-scratch mechanism): especially on 2019+ model years, corrosion bubbles develop on the driver's door sill (lower door edge where the door meets the rocker panel). Root-cause mechanism: sand/debris gets trapped under the factory paint finish and scratches the coating; salt water and moisture then penetrate through those scratches, causing corrosion from the inside out. The corrosion bubble expands yearly if left untreated. A secondary location for the same failure mode: the trunk-lid corner near the rear fender (also observed on a 2019 model). Repair sequence: remove paint/corrosion down to bare metal, apply a zinc coating (hot-dip galvanizing is most effective), then acid-etch primer, acrylic primer, and topcoat ^67891011.

Body panel corrosion under the rear-door sill trim (related report): corrosion also develops specifically under the trim/molding of the rear door sills (the bottom edge of rear doors), creating rust spots that become visible from outside once the molding is removed or lifts. This is a known issue affecting multiple vehicles — when examining a used X80, inspect under the molding, not just the visible painted surface ^121314151617.

Factory sill protective film — inconsistent application (a manufacturing-quality gap): the factory-applied protective film on door sills (пороги), intended to prevent scratches and rust, was found to be present on most doors but missing specifically on the driver's-side door sill on some units — resulting in visible rust/discoloration (orange/brown spots) exactly where the film wasn't applied. Multiple owners independently reported the same driver-side-only gap, pointing to a manufacturing quality-control inconsistency rather than an isolated defect ¹⁸¹⁹.

Media

Photo of the removed sill protector showing the clip attachment points

Photo of the sill surface underneath showing accumulated dirt and spot corrosion

Photo of expanding corrosion bubble on the driver's door sill, 2019 model

Photo showing extensive corrosion and rust under body panels and window edges

Photo showing protective film present on passenger-side door sill (clean) vs. missing on driver-side (visible rust/orange discoloration)

Related pages

• Trunk chrome trim — clips and water sealing
• Door and wheel-arch molding clips
• Front fender molding — part number and clips
• Wheel-arch liner clips — fragility and sourcing
• Door panel — removal, tweeters, and water drainage

Sources

This page is compiled from 19 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-07-25