Yes the Oil Seal # 91030 is the correct seal for your 2018 DRV Mobile Suites with 9K axles. An oil seal can be used in a greased hub as long as it is the correct size and all the oil is removed since mixing oil and grease is not recommended.
You can also measure the inner and outer diameters of the seal with 4" Carbon Fiber Digital Caliper # PTW80157 and compare those measurements to the Redline seal, 2.750 Inch I.D. and 3.779 Inch O.D. view full answer...
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