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Does 48 year old diff oil need to be changed?

Started by chrisntam, May 30, 2018, 09:38:32 AM

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chrisntam

May 30, 2018, 09:38:32 AM
Thinking about draining / refilling the diff on my '70.  No indications of leaks, seepage or anything.

Leave it as is or change it using today's 90 weight?

1970 Deville Convertible 
Dallas, Texas

ElZilchoTX

#1
May 30, 2018, 09:45:48 AM
Check it. If it still has the proper viscosity and is clean (both of which I’d venture to guess would be “no”) then leave it. Otherwise it is a great idea to change it out.
Ryan Albert Donovan - CLC # 31361
62' Cadillac Sedan DeVille

Bentley

#2
May 30, 2018, 05:45:19 PM
There was some discussion on this topic in one of my posts from a while back. About halfway down this thread, it goes into changing the differential oil. Mine's a '68, but it may be the same as your '70.

http://forums.cadillaclasalleclub.org/index.php?topic=133075.msg283468#msg283468
Wes Bentley
CLC # 30183
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