Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550 vs Mahle Coolant Expansion Tank for Mercedes-Benz R231 SL-Class
Buy the Febi Bilstein 46748 if you want the version with a built-in coolant level sensor and a stated 3-year warranty. The Mahle tank is listed only with dimensions, so there is no confirmed sensor fitment or warranty to compare. No prices were provided for either tank, so check both on Deal.ai before ordering.
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Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550
Choose the Febi Bilstein 46748 if you need a level sensor in the tank and want a 3-year warranty on record.
Pros
- Comes with the coolant level sensor, so no separate sensor purchase.
- 3-year warranty is stated.
- Cross-reference numbers make it easy to match the old part.
- Light at 0.319 kg and compact at about 40.6 cm long.
Cons
- No lid included, so you must reuse or buy one.
- Aftermarket part, not a Mercedes original.
- Sensor-equipped tanks cost more than bare reservoirs.
What separates them
| Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550 | Mahle Coolant Expansion Tank for Mercedes-Benz R231 SL-Class | |
|---|---|---|
| Coolant level sensor | Included in the tank | Not stated in the listing |
| Lid | Not included | Not stated |
| Warranty | 3 years | Not stated |
| Cross-reference part numbers | 1K0 121 407 F / 1K0121407F, part 46748 | None listed |
| Stated dimensions | 40.56 x 19.13 x 9.68 cm | 45 x 24 x 14 cm |
| Stated weight | 0.319 kg | Not stated |
| Fitment coverage | Listed for 536 vehicle applications | Listed for R231 SL-Class only |
Price history
- Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550: lowest $23.65 on Nov 1.
- Mahle Coolant Expansion Tank for Mercedes-Benz R231 SL-Class: lowest $61.70 on Nov 1 at FCP Euro.
Prices at every store
Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550
- euromotiv.comCheck price at euromotiv.com
Mahle Coolant Expansion Tank for Mercedes-Benz R231 SL-Class
- AutohausAZCheck price at AutohausAZ
- FCP EuroCheck price at FCP Euro
Specs compared
| Spec | Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550 | Mahle Coolant Expansion Tank for Mercedes-Benz R231 SL-Class |
|---|---|---|
| Durability | 3 years (warranty) | — |
| Overall Dimensions | 40.56 x 19.13 x 9.68 cm | — |
| Weight | 0.319 KGM | — |
| Highlighted Feature | With coolant level sensor, Without lid | — |
| Color | white | — |
| Typical Users | UNISEX, ADULT | — |
| Length | — | 45 cm |
| Height | — | 24 cm |
| Width | — | 14 cm |
Questions and answers
- Which tank fits a 2013 SL550?
- Both are listed for the R231 SL-Class. The Febi 46748 cross-references 1K0121407F and covers 536 applications; confirm your VIN with the seller for the Mahle.
- Does the Febi tank include the sensor?
- Yes. The Febi 46748 comes with the coolant level sensor but without a lid.
- Does the Mahle tank have a level sensor?
- The listing does not say. Ask the seller before buying, because a missing sensor means a dash warning.
- Which lasts longer?
- Febi states a 3-year warranty; Mahle states none here. Coolant tanks usually fail at seams or the sensor, so the sensor-equipped Febi has one more wear point.
- Can I reuse my old cap?
- Yes on the Febi, which ships without a lid. Check the Mahle listing for a cap before assuming.
- Is the Febi worth more money?
- No prices were given for either tank. Compare live prices on Deal.ai; the Febi's sensor and warranty justify a premium only if the gap is small.