20!!!
I can't warranty has passed!
(((gaz charge around £40 a shock for a service iirc so just send them back))
I'm gonna strip the back ones tomorrow. if there knack'd to. I'm scrapping them and putting the orignal stuff back on.
I'm sure they'll do it out of warranty when they learn how many miles they've done.
Like people have said, it's not the first time Gaz shocks have failed after a few miles.