I'm sure some of your guys are using oil cooler ,, if so what brand and is it worth it ,,,,

 

Worth it is totally subjective. If you track regularly, yes it's definitely worth it. If you live in an extreme heat climate, yes it's definitely worth it. If you have forced induction, yes it's definitely worth it. Without any of those factors, IMO it's not worth it.

Setrab makes too quality oil coolers. But you could easily build a cooler around a less expensive core like B&M, Mishimoto, TRU-cool, or a well built no name one and get similar results.

Mine is a Setrab core kit from Z1 but I'm waiting until my GTM turbo parts arrive to install it all at once.