post your latest differential fluid change

Added a squeeze bag of 75W-90 Severe Gear to replace some of the Severe Gear 75W-110 I had in the 4-pinion custom built LSD in my 2005 Ford Falcon.
 
2001 Ford F-150
Rear differential service
Out: unknown
In: Valvoline 75w140 synthetic
 
1981 Chevrolet C10
Pulled cover on rear diff to access c-clips to pull axles for axle seal replacement
Out: unknown oil
In: Lucas High Performance 80w90
 
2018 ram 1500
front diff
Out: factory 75w85 with 94k
In: mobil delvac 1 75w90
Rear diff
Out: factory 75w140 with 85k
In: mobil 1 75w140
 
2010 Ford Crown Victoria 119k miles
Out: unknown oil and mileage, according to the diff cover the department had it changed at 60k ish miles
In: Amsoil Severe Gear 75w140 W/Lubegard additive
 
2010 Hyundai Santa Fe AWD. Out=unknown. In Mobil 1 75-90 full synthetic. 1994 Chevy S10 pickup. Out=unknown. In Schaefer's w293 75-90
 
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2008 Chevy Trailblazer 4.2 ~179k mi
Out: Napa 80W90
In: Valvoline Synthetic 75W90
I put the Napa in about a year and a half ago, what came out was filthy and may have been the factory fill, so I just put the Napa in to sort of flush the rest of the crud out, and put back in 75W90 synthetic like the manual says, I only put maybe 3-5k on it since I haven't been driving much.
 
1991 Volvo 240 sedan, 222,120 miles
Out: Valvoline 75W-90 GL-5 conventional
In: LM 85W-90 GL-5
Added Belmetric magnetic drain plug and Dimple Magnetic fill plug
 
Lincoln MKZ 3.7L AWD, 140,877. Catalytic convertor swapped out so had facility change out whatever was there (FF MC?} with Valvoline syn 75W-140 gear oil as spec'd...
 
1992 MB 300D 2.5 turbo, 148,222 miles
Out: Motul 75W90 GL-5
In: LM 85W90 GL-5
 

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2023 silverado 4x4 2.7 with AAM 3.42 ratio locking rear ..... newest work truck in my small fleet

Out .....factory fill at 15k Rear was clean very little debris on magnet
Front was very dark with as little as 6 miles in 4x4 and two "events" having to use 4x4 to get un-stuck magnet was fuzzy

In .....bulk Service Pro GL-5 Syn 85w90 from a good friend's 55 gallon barrel with a date of 7-2021 on the label $20 Thank you Andrew!

The front is no fun at all
 
2008 Chev Suburban 3/4 ton front diff. 260,000 miles. The Burb is often put in 4WD in the winter.

Out: Canadian Tire 75W90 Synthetic with 30,000 miles.
In: Canadian Tire 75w90 Synthetic made by Irving Oil.

The drain magnetic had a normal amount of metal shreds plus some fluid with fine magnetic particles. Below it is the same plug cleaned up. A sample of the old and new fluids are shown.

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