I would suggest starting with contacting the manufacturer of this vehicle as they should have the exact specs for this.
However, it is hard to know for sure what the proper amount of oil is for a custom system like this.
However, the best thing to do is put the proper amount of oil in for each component as directed, and then I would add 1 oz for the additional length of line.
Once you do this, I would suggest to start checking the pressure and find out if it is in the proper range and once it is then leave it be.
Basically, the pressure is going to tell you if you have too much oil in the system as you will start to get high pressure and then AC will not cool effectively.
Unfortunately, we don't have manuals on these types of vehicles, so it is hard to give you an exact answer, which is why it is best to consult with those that built the vehicle.
Hopefully this helps. Thanks
Sunday, June 26th, 2022 AT 7:16 AM