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I assume the 60G Dewalt is an air compressor.
ISO 100 equals 30W or SAE 30.
Napa has air compressor oil in stock in their stores. Part number NOL 75115 made by Valvoline and cost $4.59 a quart.
Many farm stores also stock suitable oil for an air compressor. It will often be labeled ND and/or non detergent 30W.
Some Advance Auto Parts locations have Wolfs Head for $3.99 a quart. One store in my county stocks it while the others don't.
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