Lincoln Electric Air Vantage 600 Owner's Manual page 18

The compressor system is a closed loop. After draining
oil, there will be some residual oil remaining in various
components of this system. Use caution when re-filling
the system with oil to ensure that the oil level does not
exceed the high mark indicated on the dipstick.
Overfilling could lead to oil in the discharge air.
2.4.5 Use a funnel inserted into the dipstick hole and pour in VMAC
certified oil.
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VMAC – Vehicle Mounted Air Compressors
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