Probably seems like a dumb question but... I have forgotten how to test a gas damper, have taken one off (front) of a 123 series which is an aftermarket make.
When fully compressed by hand should it return immediately to max length as would an oil filled type? This one takes a few minutes??

Thanks in advance.

It should return smoothly within seconds.

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2007 C 230 Sport.

Thanks
I suppose I was fooled by how new they look!

Don't be fooled by looks.
That's how I ended up with my wife.

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2007 C 230 Sport.

Looks like a pair of new ones then, who knows if those for a 124 will fit or do they have struts??