JCB 215S

New member seeking advice on suitable hydraulic oil options which cost less than JCB Hyd oil. Possibly a “no zinc” AW 46 oil? Also advice on how to flush old hyd oil from the lines, cylinders, valves etc. when changing out hyd oil? Anyone flushed out a system by replacing filters and oil then disconnecting return lines, operating cylinders in and out....catching return oil in a container until all is clean.....while keeping tank topped off with new oil? Thank you in advance for your help.

Welcome to HEF, Flying !
A good quality AW46 should be ok if it meets JCB's specs.
Here is a link to thread about flushing a hydraulic system. There are two links in that thread that will give you detailed instructions for it.

Thank you for the quick reply. Could not see the links??? Would you send again?? Thanks again!

oops !!
I forgot to insert the link.
https://www.heavyequipmentforums.com/threads/best-way-to-flush-a-hydraulic-system.20793/#post-262665

Thank you Tinkerer!!!