I've searched, but I gotten convoluted answers that segue off topic in the threads I've read. Will the S4 turbo (water and oil) lines fit on an S5 turbo? Lines are currently mated to an S4 turbo-S4 front cover combination, but I'm switching out to the S5 turbo. I'm in the process of ordering a few bits, and curious whether I'll need the new gaskets for an S4 or an S5 turbo.

 

You can reuse the oil and coolant lines, best to replace the gaskets or a little rtv on the old gaskets, I have s5 turbo in my s4, reused the lines

 

You don't put any RTV on turbo gaskets.