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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #1  
Old 01-14-2020
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Steelwheels Steelwheels is offline
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Default Rear Differential oil 87-89fc35

What rear differential oil are people using in there rear diffs and change interval?
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Old 01-15-2020
Captain Fred Captain Fred is offline
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Kiki,
I haven't changed mine yet but I believe most are using 85w140 as there have been leakage probs with the 80w90.

Other opinions from the more experienced of us ?
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Old 01-15-2020
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Read the tag on the axle as some are synthetic
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Old 01-15-2020
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85-140 synthetic. Doesn't matter what it came with from the factory. I think all the 80's birds used the same rear axle with different gears.
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Old 01-15-2020
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Quote:
Originally Posted by Captain Fred View Post
Kiki,
I haven't changed mine yet but I believe most are using 85w140 as there have been leakage probs with the 80w90.

Other opinions from the more experienced of us ?

Yours has 85/140, changed in spring of '19. Only the 500 delivery miles on the oil.


The oil had to be changed 3 times to get the synthetic stuff from PO out. Synthetic was weeping/seeping on passenger/curb side.


thread: https://www.wanderlodgeownersgroup.c...ad.php?t=23115
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Last edited by shaaksma; 01-15-2020 at 12:30 PM.
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Old 01-15-2020
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Quote:
Originally Posted by shaaksma View Post
Yours has 85/140, changed in spring of '19. Only the 500 delivery miles on the oil.

The oil had to be changed 3 times to get the synthetic stuff from PO out. Synthetic was weeping/seeping on passenger/curb side.

thread: https://www.wanderlodgeownersgroup.c...ad.php?t=23115
The synthetic didn't cause your leak. Thicker lube could slow down an existing leak, but you had a cracked hub or something leaking.
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Old 01-15-2020
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I thought if I go to synthetic I need to get the oil out of the hubs to ?

Can you mix the two types ?

Crit, there’s a tag on there where do I look for that ?
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Old 01-15-2020
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Quote:
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The synthetic didn't cause your leak. Thicker lube could slow down an existing leak, but you had a cracked hub or something leaking.


I have no idea. I took the bus into the shop and had mobile mechanics come out. No one wanted to touch it without being able to readily identify the root cause. Switching back to heavy dino oil was the recommendation that eliminated the leak.


I don't no the weight used by PO, but it was a synthetic.
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Old 01-15-2020
Captain Fred Captain Fred is offline
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hi Shawn,
Just so know the bus still has no sign of a leak @ the axle. This isn't the first time that I have heard someone change over to synthetic and had a leak develop. Change back to Dino and it goes away. I know it doesn't make any sense but I guess it happens.
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Old 01-15-2020
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I have read that synthetic does a better job cleaning out sludge so it could remove deposit acting as seals.
I think last time I changed I went with a 80/90wt I had asked Bill.

What change interval are people going with ?
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