90W Gear Oil Spec'd For Motor Home Hubs

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Jul 31, 2014
Alberta, Canada & Texas USA
My 2005 Workhorse W20 Motorhome Chassis specs SAE 90W GL-5 Gear Oil for the Front Wheel Bearings with Oil Filled Hub. Synthetic is not mentioned so I expect this is DINO oil. As spec for Rear Axle differential is Synthetic Rear Axle Fluid SAE 75W-90 GL-5 Gear Oil, would this be an acceptable substitute? Thanks Gord & Linda w/ "Camper" the Cat Coaldale, AB (May-Oct) & Mission, TX (Nov-Apr) Travelling Coach: 2005 Safari Trek 28RB2, Workhorse W20 Chassis, 8.1L V8, Allison 1000 5 spd AT Car Hauler: 2014 JIMGLO Ego Custom 17'+ Aluminum Tilt-Bed for Abarth or Corvair + Mobility Scooter. Daily Driver/"Toad": 2014 Fiat 500c Abarth Cabrio Turbo 1.4L I4, 160hp, 5 spd MT Vintage Car 2B: 1965/66 Corvair Corsa Convertible, Air Cooled 164cid Boxer 6, 4 x 1bbl carbs, 140hp, 4 spd MT Stationary Coach: (Mission, TX) 2008 HitchHiker 34.5 UKSBG, 36' 5th wheel w/ 3 Slides
There is no SAE 90w. I'd also use a 75w110. Amsoil, Redline, and Driven(joegibbs) are some choices. Royalpurple has a SAE90 and an 80w90. Amsoil also has an 80w90. The other option is to blend your own thick 90 grade(or 110) by mixing a 75w90 with 25-50% off 75w140.
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