Nylog, Oil? Where does it go? - Short #238

HVAC School - For Techs, By Techs · Apr 29, 2025 · 7m

In this short podcast, Bryan answers a listener-submitted question about Nylog, oil, and where you put them when you're making flares.

Nylog is a thickened refrigerant oil (which is either POE for Nylog Blue or mineral oil for Nylog Red), and it's miscible with the refrigerant and moves with it through the circuit. You don't want to put excess Nylog on valves, but a small amount won't do harm. There are a lot of concerns about Nylog voiding the warranty, but it doesn't actually do that because it's nearly impossible to prove that Nylog caused the issue.

Like oil, Nylog helps connections fit…