| Ive always been told Nismo is the best for fit and function on the oil cooler. Plenty big cooling surface area too. OEM works fine however unless your doing some racing/autocross/high temp dabbling.. Im still on the stock oil cooler but plan on upgrading eventually.. cant chime in on the z1 earls or setrab's.. maybe someone else who has it can. I like my Koyo radiator setup.. has been in my z for 6 years.. pretty much dropped right in and keeps it running cool. If your upgrading.. really Koyo or Howe is best way to go.
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