GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Oil for Minisplit Flare Nut Threads

Nathan_PA | Posted in Mechanicals on

Hello All,

I am DIY installing a Fujitsu minisplit (15LZAS) in my basement. The install manual says to use Alkylbenzene oil on the threads of the flare nuts. I can only find alkylbenzene oil available in 1 gallon or larger quantities, which is both expensive and wasteful for just needing to make 4 connections. Google tells me that POE oil should also be comptatible with R410A. Can I use POE oil safely for the threads? Does anyone have an idea of where to find Alkylbenzene oil in smaller quantities?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. kyle_r | | #1

    Nylog blue is what I have seen recommended for 410a systems

    1. aunsafe2015 | | #2

      Yup, this is what I see recommended most frequently.

  2. Nathan_PA | | #3

    Thanks all!

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |