Need to know what hyd/air compressor fluid

by marshall davis
(Inverness, Fl 34450)

Our company has purchased a large sandblaster that has an Atlas Copco compressor on it. All fluids have been drained and not enough fluid to get a sample.

Name plate has been damaged. TYPE O.P.S.1-91 or O.R.S.1-91
SERIAL # might be ARP_7_373
0 9
Need to know what grade oil to use -hyd or air compressor? & amount

Marshall Davis

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