UPDATE: We received the following statement from Mercedes-Benz: "In rare instances, we incorrectly ordered some of the replacement parts for the seating surfaces. The approved replacement parts will not demonstrate the previous symptoms."

It appears Mercedes-Benz has another problem with "bleeding seats" in 2015 C-Class sedans.

As we reported in January, an oily residue has been appearing on some versions of the C-Class with man-made MB Tex upholstery, making it look as though the seats were grimy or "bleeding." Mercedes issued a technical service bulletin to its dealers to remedy the problem, but now we're hearing the fix isn't complete.

Small parts of the seats – the rear bolsters and a piece below the center armrest – weren't replaced during service and then developed the oily reside again, a source tells us. This occurred within a few days of their service appointment. The dealer followed Mercedes' instructions, our source said, and their C-Class appears to have been one of the first cars fixed.

"I'm absolutely flabbergasted at this point ... The new C-Class is such a good car. This is just a shame," they told Autoblog.

2015 Mercedes C-Class seats

The bleeding seat issue appears to affect US-built C-Class models with the MB Tex vinyl and possibly other interiors. The bleeding often occurs when a car has been sitting in the cold and then heats up quickly. The number of cars affected is unclear, though the C-Class owners have been vocal in the MBWorld.org forum.

At the time of our original report, Daimler AG, parent of Mercedes-Benz USA, said it was aware of the issue and that no injuries had been reported. The residue usually washes off with soap and water. The National Highway Traffic Safety Administration had no recalls, complaints or investigations recorded about the issue as of Wednesday.

The fix at the dealer involves changing out the headrest and seat covers, except for a part of the passenger seat that needs to be calibrated by the factory, according to the bulletin.

The C-Class is a critical car for Mercedes as it battles BMW, Lexus and others for supremacy in the ultra-competitive luxury segment. The C-Class, which launched last fall, is moving upmarket as Mercedes reshuffles its lineup with the addition of the CLA sedan. The C-Class was the company's best-selling model in January with volume of 6,236 units.

2015 Mercedes C-Class seats

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