[BMWrules7]

Originally Posted by MWPos

I purchased the two springs, but didn't put them in my car before selling my car

I had the same symptom as you, and the service guys showed me that the springs' struts were leaking. Each of the springs does have a strut.

Here are the part numbers:
Tension spring, trunk lid/tailgate 51247204366 (goes on the left side)
Return spring, trunk lid, right 51247204367 (goes on the right side)

My dealer gave me his price on these springs, and they still have their shipping tags on them.

Want them? I see from your car's age that it is the same as mine was, and probably not under warranty.

You are a good man.