Hyundai HCP9100 User Manual page 13

2. Connect Hose to Compressor - Pull back the quick-connector and insert
into the base of the outlet. Press firmly into opening and ensure that the
quick-connector clicks into place. Repeat when connecting to Air Tool.
3. Check engine oil (see section 3.1). If necessary, add oil - Open oil inlet
located near the recoil starter handle. Remove the dipstick and pour in
the supplied oil with a funnel. Do not operate without oil.
Reservoir can hold maximum 20 fl.oz of 10W30 oil - do not over fill.
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