Automotive Air Conditioning Information Forum (Archives)

Thecosmicenergy on Mon April 13, 2015 7:42 AM

Year: 2001
Make: Chevy
Model: Malibu
Engine Size: 3.1V6
Refrigerant Type: r134a
Country of Origin: United States

Can I use "regular" drugstore mineral oil instead of "525" mineral oil, on the green o-rings in the ac fittings during reassembly?

Dougflas on Mon April 13, 2015 10:13 AM

You should be using a product called "Nylog". Drugstore mineral oil is not the same as 525 AC mineral oil that was used in R12 systems.

wptski on Mon April 13, 2015 11:28 AM

Quote
Originally posted by: Dougflas
You should be using a product called "Nylog". Drugstore mineral oil is not the same as 525 AC mineral oil that was used in R12 systems.
That's true but even the manufactures of Nylog has stated in a HVAC forum that when it comes to using red or blue Nylog on "O" rings the amount is so small, it doesn't really matter.

James89dx on Mon April 13, 2015 11:49 AM

I have always read that you can use dialectric grease on the O-rings too. I have used it several times without issue

Thecosmicenergy on Mon April 13, 2015 3:08 PM

I DO have some dielectric grease. I suppose I'll use that.

James89dx on Mon April 13, 2015 4:26 PM

Make sure you use it sparingly. The grease is pretty thick and easy to accidentally let "scoop" into the hard line you're putting the o-ring over. So if that happens you obviously want to wipe it out with a clean blue/shop towel or something before putting the line together.