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For RP3600, RP5500, RP6500 E, RP7500 E, and INV2000: Remove the oil cap to check the oil level on the attached dipstick.
For the RP12000 E: To check the oil, first remove and clean the gague with a clean dry towel.Then insert the guage until it is seated and remove it to check the level of against the graduations marked on the gauge.
Detailed instructions are available in the Owner's manual (see Maintenance section).