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Old 04-20-2016, 10:59 PM   #11
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Location: Danglebury, Tejas
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Year: 1999
Coachwork: Blue Bird
Chassis: IH 3800
Engine: Navistar DT466E
Rated Cap: 72 passenger
Blech! Chinese straight-grade dino oil with a CF spec? About the only thing I have that would use it would be a 6/1 listeroid... And that sucker will happily run on bacon grease as both a lube AND fuel.
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Old 04-21-2016, 12:47 AM   #12
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Location: Southeast British Columbia
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Year: 2003
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Right from the freightliner school bus manual
*

Recommended
Lubricant Type
Hypoid Gear Oil
API Service
Classification GL–5
Ambient Temperature
Lubricant SAE
+10°F (–12.2°C) and up
*
Viscosity Grade
85W–140 0–76–A
–15°F (–26.1°C) and up
*
80W–140 0–76–B
–15°F (–26.1°C) and up
*
80W–90 0–76–D
–40°F (–40°C) and up
*
75W–90 0–76–E
–40°F (–40°C) to +35°F (+2°C) 75W 0–76–J
–40°F (–40°C) and up
Synthetic Gear Oil
–40°F (–40°C) and up
*
*
Meritor
Specification
75W–140 0–76–L
75W–90 0–76–N
–40°F (–40°C) and up
*
There is no upper limit on these ambient temperatures, but axle sump temperature must never exceed 250°F (121°C).
Table 3, Meritor Drive Axle Approved Lubricants
75W–140 0–76–M
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Old 05-07-2016, 03:33 PM   #13
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Join Date: Mar 2016
Location: Danglebury, Tejas
Posts: 310
Year: 1999
Coachwork: Blue Bird
Chassis: IH 3800
Engine: Navistar DT466E
Rated Cap: 72 passenger
Follow-up: I compared what came out of the rear-end to some fresh lube. What was in there was definitely not 15w40. I'm 95% sure it was 75w90 or thereabouts based on viscosity. It was definitely NOT motor oil, as it had the "gear oil smell and sheen" that I associate with zinc-based additive packages. So that was a relief. And frankly, it looked darned good for being in there for 3 years (but only about 4000 miles according to the records).

As an experiment, I ran it for a week with some cheap generic 90w lube from Tractor Supply that was on sale, and then I drained it and refilled with 75w140 Mobil Delvac synthetic (the local dealer, who appears to be a complete doofus, kept giving me excuses as to why the Lucas stuff hadnt arrived. I cancelled the order and got the Delvac which the local tractor pullers swear by). Its noticably quieter now.

This lube may be a bit thicker than the optimal spec, but I've never heard of a diff hurt by running a thicker lube in hot areas. All of my driving will be in the heat, (and 90% of it through a desert in the middle of summer), so I'm happy to have the thicker stuff in there.

Thanks to all who provided comments and guidance!
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