Hi Guys.
I have a site with a chiller which has 2 Copeland scroll comps.
Which have a sight glass each and a 3/8 copper oil balance line between the 2 comps.
Both are low on Oil.
Can I get away with adding Oil via the suction line. As there is a Schrader fitting on it just down stream of the comp suction port.

On other sites these lines have been Moded with a Schrader fitted into the balance line.

Only that would mean shutting the chiller down and a gas recovery.

What's recon Guys?
Grizzly