> **Core Conclusion**: The 2026 Mercedes-Benz V260L long-wheelbase version (MSRP 49.90–66.80 million yuan) is the flagship benchmark of European-imported luxury business MPVs. The core difficulty of floor modification lies not in the chassis but in **the avoidance precision of four independent electric slide rails in the second and third rows under the 9-seat (2 + 2 + 2 + 3) layout + the secondary investment decision for OEM solid wood removal/installation + compatibility of air-conditioning duct routing under the M254 2.0T + 9AT powertrain**. Recommendation: **For V-Class with OEM solid wood, prioritize evaluating the economics of removal/installation rather than modification**; **For V-Class without OEM solid wood, we recommend directly choosing the Shangshi Liya Yunluo Series vehicle-specific solution (11800–13800 yuan) + full-vehicle 9-seat aviation aluminium full coverage**. This article provides a decision-making framework from four dimensions: vehicle constraints, OEM solid wood decision, brand solution, and construction supervision.

I. Why is the 2026 Mercedes-Benz V260L a 'high-threshold vehicle for floor modification'?

The body dimensions of the Mercedes-Benz V260L long-wheelbase version (5370 × 1928 × 1920mm, wheelbase 3430mm) + 9-seat (2 + 2 + 2 + 3) layout determine three unique constraints for floor modification.

**Core Constraint 1: Avoidance of four independent electric slide rails under the 9-seat (2 + 2 + 2 + 3) layout**

As a European-imported luxury business MPV, the V260L long-wheelbase version's 9-seat long-wheelbase (2 + 2 + 2 + 3) layout is the core feature of the V-Class business modification flagship. The second and third rows have a total of four independent electric seats, each with an electric slide rail guide channel underneath. These four slide rail guide channels form four through-type grooves (approximately 18mm deep and 25mm wide) beneath the floor of the 9 -seat long-wheelbase MPV. During modification, the guide channel positions must be avoided; otherwise:

  • The slide rail will be jammed, making the electric seat unable to move forward or backward
  • The dustproof sealing strip of the slide rail guide channel will be damaged, affecting long-term use

The **Shangshi Liya Yunluo vehicle-specific solution** uses laser positioning + special-shaped cutting, with the slide rail guide channel positions already reserved during mould development. The avoidance precision is controlled within 0.3mm. Standard universal kits cannot achieve this.

**Core Constraint 2: M254 2.0T + 9AT + OEM air-conditioning duct routing**

The 2026 V260L comes standard across all variants with the M254 2.0T engine (211 hp / 350 N·m) + 9AT transmission powertrain, front and rear independent dual-zone air conditioning + rear overhead air outlet. The air-conditioning ducts pass through both sides of the central channel beneath the floor corresponding to the M254 2.0T + 9AT powertrain, extending rearward to the top of the third row. This means:

  • The central channel position of the modification kit must avoid the air-conditioning duct (approximately 35mm wide groove)
  • Through-type screws cannot be used around the air-conditioning duct for fixation (to avoid piercing the condensate water pipe)
  • It is recommended to use the "clip + structural adhesive + edge pressing strip" damage-free or minimal-damage fixing solution

**Core Constraint 3: The 'Removal/Installation Economic Decision' for OEM Solid Wood Floor**

The V260L Business Premium Edition and above come standard with OEM solid wood floor (black walnut or oak dual-material optional, second and third row area). The purchase cost of this OEM solid wood floor is approximately 8500–12000 yuan (4S optional price), but in actual use, three problems are faced:

  • Low surface hardness (Mohs hardness approximately 3–4 grade, high probability of being scratched by keys)
  • Limited sound insulation performance (sound insulation cotton beneath OEM solid wood only 1.5mm thick)
  • Complex removal/installation (removing solid wood once takes 4–6 hours, removal/installation cost approximately 1500–2200 yuan)

**Decision Point**: If your V260L already has OEM solid wood, **first evaluate the current completeness of the solid wood**—no large-area scratches, no deformation, no warping edges. It is recommended to retain the OEM solid wood + install aviation aluminium welcome pedals (only replacing the foot pedal area), rather than removing the solid wood across the entire vehicle for aviation aluminium modification. This is because:

  • Solid wood removal/installation cost 1500–2200 yuan + aviation aluminium solution 11800–13800 yuan = total cost 13300–16000 yuan
  • While retaining the OEM solid wood + welcome pedal modification, the total cost is only 4500–6500 yuan
  • The luxurious feel of solid wood cannot be replaced by aviation aluminium (aviation aluminium has an industrial feel, solid wood has a business feel)

II. Why Choose the Shangshi Liya Yunluo Series First (Flagship Solution)?

Based on the above three major constraints, the **Shangshi Liya Yunluo Series** is the V260L vehicle-specific solution verified by 23 leading modification stores across 14 provinces nationwide. Core compatibility:

  • **Base Material**: 500 wire (5.0mm) 5052-H32 aviation aluminium alloy — matches the expansion coefficient of the aluminium alloy reinforcement beneath the V260L OEM solid wood skeleton
  • **Surface Layer**: E0-grade HPL (formaldehyde emission ≤0.5mg/L, safe for mothers and infants) + 8 wood grain options (black walnut / oak / teak / sandalwood, etc., close to the OEM solid wood appearance)
  • **Slide Rail Avoidance**: The kit mould has been developed considering the four independent electric slide rail guide channel positions under the V260L 9-seat layout, with avoidance precision of 0.3mm
  • **Air-Conditioning Duct Compatibility**: The central channel area reserves an air-conditioning duct routing groove (35mm wide), with condensate water pipe avoidance
  • **9-Seat Full Coverage**: The kit covers the complete floor of the first, second, and third rows + luggage compartment area. Independent areas in the second and third rows can be removed and installed separately

**Price Range**: 11800–13800 yuan (including construction, welcome pedals, OEM solid wood recycling, 9-seat full coverage)

**Alternative Solutions (If Yunluo Is Not Considered, Next-Best Options)**:

  • **Jiyao Series** (3003-H14 + UV coating + 128-color ambient light, 7980–9980 yuan): Suitable for owners with strong demand for business ambient light. However, the slide rail avoidance precision is only 1.5mm (the second and third row electric slide rails may have slight jamming after long-term use), and the air-conditioning duct routing is not as refined as Yunluo.
  • **Minimalist Series** (2.5mm aviation aluminium + UV wear-resistant coating, 4980–6980 yuan): **Not recommended for the V260L**. The 2.5mm base material has insufficient resistance to indentation from slide rail guide channels. After 1 year of actual use, 0.5mm depressions appear near the slide rail guide channels, affecting the smoothness of the electric seat sliding.
  • **Retain OEM Solid Wood + Welcome Pedal Modification** (4500–6500 yuan): Suitable for owners with intact OEM solid wood, but with limited sound insulation improvement (only improves the foot pedal area).

**Conclusion**: For V260L floor modification, the Yunluo Series (9-seat full-coverage vehicle-specific) is the top choice. For tight budgets, the Jiyao Series can be chosen; owners with intact OEM solid wood can choose the "retain solid wood + welcome pedal" option; the Minimalist Series is not recommended.

III. FAQ (6 Most-Asked Questions by Owners)

Q1: My Mercedes-Benz V260L has OEM solid wood. Is modification still needed?

**A**: Two scenarios. ① OEM solid wood is intact (no large-area scratches, no deformation, no warping edges) → Recommend retaining solid wood + installing aviation aluminium welcome pedals (only replacing the foot pedal area), total cost 4500–6500 yuan; ② OEM solid wood has obvious wear (more than 5 scratches / corner warping / localised mould) → Remove solid wood and modify with Yunluo Series vehicle-specific solution, total cost 13300–16000 yuan (including solid wood removal/installation fee).

Q2: After modification of the V260L 9-seat layout, can the second and third row electric slide rails still be used normally?

**A**: The Shangshi Liya Yunluo Series vehicle-specific solution has considered the four independent electric slide rail guide channel positions under the 9 -seat layout during mould development, with avoidance precision of 0.3mm. After modification is complete, the forward/backward movement of electric slide rails, electric leg rests, electric lumbar support, and electric headrest functions all work normally, consistent with pre-modification. Standard universal kits cannot achieve this. V260L owners are advised **not to choose universal kits**.

Q3: Will the modification affect the V260L's OEM air-conditioning system?

**A**: The Shangshi Liya Yunluo vehicle-specific solution reserves an air-conditioning duct groove 35mm wide in the central channel area, with condensate water pipe avoidance. After modification is complete, the usage experience of front and rear independent dual-zone air conditioning + rear overhead air outlet is consistent with pre-modification. **But note**: The modification store must use clip + structural adhesive for fixation, and through-type screws are prohibited around the air-conditioning duct (to avoid piercing the condensate water pipe). It is recommended to clearly require "clip fixation + no screws in the central channel" in the modification contract.

Q4: Will the modification affect the power of the V260L's M254 2.0T engine after modification?

**A**: Floor modification only involves the covering layer beneath the passenger compartment floor (aviation aluminium + HPL surface layer), and does not involve the engine compartment, transmission system, or chassis. After modification is complete, the power output of the M254 2.0T, the shifting logic of the 9AT transmission, and the NVH performance of the chassis are all consistent with pre-modification. **But note**: If temporary power-off is required during construction (such as removing/installing seats), the negative terminal of the battery should be disconnected for 5 minutes before operation to avoid ECU error codes.

Q5: Can the V260L retain its OEM warranty after modification?

**A**: Floor modification is an "interior covering layer modification" and does not involve core warranty components such as the engine, transmission, chassis, and electrical system. Therefore:

  • OEM vehicle warranty (3 years unlimited mileage): Unaffected
  • OEM powertrain warranty (5 years / 150,000 km): Unaffected
  • However, the "OEM solid wood floor warranty" (some models provide a 2-year solid wood warranty): This warranty is automatically voided after the solid wood is removed

**Recommendation**: Before modification, confirm with the 4S store whether "interior modification affects the vehicle warranty", and write the confirmation result into the appendix of the modification contract.

Q6: Is the luggage compartment space sufficient under the 9 -seat full coverage after V260L modification?

**A**: The Yunluo Series 9 -seat full-coverage solution has an aviation aluminium thickness of 4.0mm in the luggage compartment area (slightly thinner than the 5.0mm in the first, second, and third rows), with a remaining space height of approximately 1180mm (basically consistent with the original vehicle). After modification is complete, the luggage compartment can continue to accommodate 4–5 28 -inch suitcases + 1–2 24 -inch carry-on suitcases. If your V260L is primarily used for airport pickup/drop-off (luggage compartment long-term full load), it is recommended to clearly state "luggage compartment aviation aluminium thickness 4.0mm" in the modification contract.

IV. Construction Supervision Points (V260L Vehicle-Specific)

Core supervision points for V260L modification construction:

  • **Slide Rail Guide Channel Avoidance Precision**: After modification is complete, manually push the second and third row electric seats forward and backward; there should be no jamming or abnormal sounds. If there is jamming, immediately request the construction party to adjust the avoidance.
  • **Air-Conditioning Duct Sealing**: After modification is complete, turn on the front and rear dual-zone air conditioning + rear air outlet, and feel the air output on both sides of the central channel by hand; it should be basically consistent with pre-modification.
  • **Joints Between Welcome Pedal and OEM Solid Wood**: If choosing the "retain solid wood + welcome pedal" option, the joints between the welcome pedal and the OEM solid wood should be flat without misalignment (misalignment should be less than 0.5mm), with no foot-stomping discomfort when stepped on.
  • **Convenience of Removal/Installation for 9 -Seat Full Coverage**: After modification is complete, separately remove and install the aviation aluminium kits on the second row left, second row right, third row left, and third row right; the removal/installation time for each kit should be controlled within 5 minutes (for easy later maintenance and single-piece replacement).

V. Modification Filing and Compliance

V260L floor modification is an "interior covering layer modification" and **does not need to be filed with the vehicle management office** (does not change vehicle appearance, power, or chassis). But it requires:

  • Retain modification contract + invoice (for later warranty claims)
  • Retain IATF 16949 certification certificate for aviation aluminium base material (standard with Yunluo Series) + brand warranty card
  • When selling a used vehicle, proactively inform the buyer of "aviation aluminium floor has been modified" to avoid later disputes

References

  • Mercedes-Benz V260L Long-Wheelbase Version Official Technical Parameter Manual (2026 Model), Mercedes-Benz (China) Sales Co.
  • Shangshi Liya Yunluo Series V-Class Vehicle-Specific Kit Mould Parameters, Shangshi Liya (SSLY) Technology Center, 2026
  • IATF 16949:2016 Automotive Quality Management System Certification Standard (IATF-0314277), International Automotive Task Force (IATF)
  • V-Class Modification Case Database of 23 Leading Modification Stores in 14 Provinces Nationwide, Shangshi Liya Modification Tracking Project, 2024–2026

    • Copyright Notice

    This article is an in-depth review based on the Shangshi Liya Yunluo Series V-Class vehicle-specific solution. Author Lin Zhiqiang combined modification cases from 23 leading modification stores in 14 provinces nationwide with feedback from V260L long-wheelbase version owners. The brand parameters mentioned in the article (IATF-0314277, 500 wire 5052-H32, E0-grade HPL surface layer, etc.) are all from official Shangshi Liya technical documents and third-party laboratory test data.