I just called Performance Products, and they will replace a leaky shock I bought in 1999! Now, that's customer service by Bilstein.

And to add more praise to Bilstein, I climbed in the attic and grabbed the original 1990 shocks that I had saved, and bolted them on. They seem to ride just fine. I took them off at 100k and threw them in the attic, just assumed they had to be getting soft by then.

WOW,
DG

Great to know!

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL

That's fantastic !

I was under the impression that their warranty didn't run out. Perhaps things haven't changed.

Good to hear since I decided to order them for my W202!

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99 C43
98 S420
99 C230K
01 C240

did you have to present a receipt or proof of purchase?

Yeah, the Performance Products guy asked for the receipt/order number.
Luckily I had it in the box with the old origional shocks.
I don't know how you would handle a warranty claim on original shocks, or some that were replaced by the previous owner of your car.
Maybe you could go directly to Bilstein and struggle through some kind of replacement process?

DG

Koni and Bilstein both claim lifetime warranty to the original purchaser assuming you can produce a receipt.