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For anyone who has changed the diff fluid in their 4bw: a little research has suggested that I should use 75w-85 SAF-EH Modified Low Viscosity Rear Axle Lubricant - 1 qt - GM (19418501) Can you please confirm that this is the correct fluid? GM wants $75.00 per quart!!! Is this made from unicorn...

....and bought a 2026 CT4-V Blackwing. Started researching these in December 2023. Decided I wanted one in April 2024. Sold my VW in June 2024. Ordered the 4BW in September 2024. Wondered why it was taking so long in January, February, March, April, May, and June 2025. Took delivery in July...