Don't tell that to the many people with 30k+ or some up to 60k miles on stock shocks and eibach prokits...
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As I said originally,
it depends on your driving and the spring and how many miles are already on your stock shocks.
There are reported cases on here with people having to replace them at 15-20k miles (you should know that). I rather under-estimate than over-estimate.
If you tell someone 60k and it blows at 20k, they are going to be ticked and you look like the idiot who gave bad advice.
However, if you are conservative and tell them 20k and it blows at 60k, then they are a happy camper.
Plus, what if his stock shocks already have 40k miles on them? He was asking for an estimate without me a) knowing his driving style, b) knowing what type of spring, and c) knowing how many miles are already on his stock shocks. Its a COMPLETE guess to anyone.
You are arguing with me for the sake of arguing over a random guesstimate without knowing any detail about the car, spring type, or miles on it and I clearly stated beforehand that the real answer depends on a lot of un-measurables. Stop it.
Since you seem to know it all, exactly how many miles will his stock shocks last on an unknown spring, with an unknown driving style, with an unknown amount of wear already on the shock?