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
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
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...
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!
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.