Which tank fits an R231 SL550 better?

The Genuine Mercedes-Benz 2305000149 is made for the R231 SL550 and is the exact part being replaced. The Febi 46748 is an aftermarket tank that cross-references a different part number, so confirm fitment before buying.

Does the Febi tank include the coolant level sensor?

Yes. The Febi Bilstein 46748 comes with a coolant level sensor but without a lid. The Genuine Mercedes listing does not mention a sensor.

Which one lasts longer?

The Genuine Mercedes part is the factory original and typically lasts the life of the original tank. Febi backs its tank with a 3-year warranty, which is the clearest durability figure between the two.

Is the Genuine Mercedes tank worth the extra cost?

If the price gap is small, yes, because you get the exact OE part with no fitment risk. If you want to save money and need the sensor included, the Febi is the practical choice.

Can I use the Febi tank on other vehicles?

Febi lists 536 vehicle applications for part 46748, so it covers many models beyond the SL550. Check your vehicle against the cross-reference 1K0 121 407 F before ordering.

Do either of these come with a cap?

The Febi 46748 is sold without a lid, so reuse your existing cap or buy one separately. The Genuine Mercedes listing does not state whether a cap is included.

Febi Bilstein Coolant Expansion Tank for Mercedes-Benz R231 SL550 vs Mercedes-Benz Genuine Mercedes-Benz Coolant Expansion Tank for R231 SL550 (2014)

Buy the Genuine Mercedes-Benz tank if you want the exact factory part and the longest service life on an R231 SL550. Buy the Febi Bilstein 46748 if you want a lower-cost aftermarket tank with a coolant level sensor included. No prices were provided for either part, so compare current store prices on Deal.ai before deciding.

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