I have the same year Benz and model that you have. I purchased Mercedes pads (not sure what textar pads are) for the front of my car. I got 20K miles out of them in about a year and a half time period.

I do 80/20 highway/city driving with my car. I believe the composition of the pads are designed such that they dissipate faster, and don't compromise the rotor.

I am probalby abnormally rough on my brakes though. I thought I should have gotten more life out of them as well.

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'82 300SD 206K miles Anthracite Grey received 250,000 Km badge
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