Been asked to work on a chiller for the first time and I'm getting a little stuck. Its a cosfi chiller with bitzer compressor.
So far I've reclaimed gas, pressure tested with ofn and rectified a leak.

I've now been asked to perform an oil change while the system is degassed. I've found the drain plug and drained the oil.
Is there any way to add oil without the use of an oil pump? I'm now completely stuck.

Can anyone please help?