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I cannot tell you off the top of my head the specific oil specified, but it is listed in the Prevost service and owner’s manuals. I just changed mine a few months back and got it from Amazon.

I wouldn’t attempt to deviate from what is required because that gear box is under very heavy loads and when the second stage in the fan kicks in I have heard people say it takes about 30 HP which is a lot of work for such a little box.

[DON]

3 yrs and 10k miles ago I changed the gear oil in mine Superior gearbox with 1 qt of Amsoil Serve Gear oil (SVO) 75-90w. I believe Mobil1 75-90w synthetic gear oil would work great.

Here is what the Superior Service Manual says about Lubrication:

LUBRICATION

All gear drives are factory tested prior to shipment. They include the correct amount of oil unless specified by the customer to be shipped dry. Shaft bearings are splash lubricated and partially submerged in oil when the gear drive is mounted horizontally. After installation, remove the dipstick and verify correct oil level. If no dipstick is provided, determine level by any appropriate method. In general, the oil level should be approximately half the depth of the gear drive (to the parting line) for horizontal mounting, or to the shaft centerlines, if mounted other than horizontally. Prior to operation, make sure the gear drive contains the correct amount of oil. If under-filled or over-filled, damage to the gear drive or injury to personnel may result.

Approved Lubricants: • For gear drives operating in an ambient temp of 15° to 125° F, and oil temperatures to 200° F, Mobilube HD 80W-90 (or equivalent) is recommended. • For gear drives requiring start-up in an ambient temp below 15° F or operating continuously above 200° F, Mobilube synthetic SHC 75W-90 (or equivalent) is recommended

Here is a link to the manual: Superior Service Manual link

[Bill]

Don your are a awesome guy you have a lot of knowledge and I always appreciate your input thanks’ Art

[Bob]

thanks for all info guys.