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2013 XTS Premium
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7 Posts
Discussion Starter #1
I was under the car recently and noticed a slow leak from the transfer case output seal. At 190,000 km (~120k miles) I'd like to change the fluid for both the transfer case and rear diff.

Are there specifications available for type of fluid and fill instructions?
 

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Cadillac CT6 (2019)
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2,323 Posts
It is on page 11-13 of your service manual. Transfer case all wheel drive: Transfer case fluid GM Part No. 19256084, in Canada 19256085 (can't help you on fill instructions)
 

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Discussion Starter #3
That's all I've found so far. Nothing seems to list the rear differential fluid nor are there fill instructions. "Lifetime" fill doesn't apply if all the fluid eventually leaks out...
 
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