Cadillac Owners Forum banner

1 - 14 of 14 Posts
S

·
Guest
Joined
·
0 Posts
Discussion Starter #1

·
Registered
2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
Joined
·
26,323 Posts
Regardless of brand, DEXRON VI is superior to III, and it is synthetic only. There will be no difference in performance, however.
 
S

·
Guest
Joined
·
0 Posts
Discussion Starter #3 (Edited)
Cool so whats best to switch to DEXRON IV or stick with the III, i see the IV is a little more expensive is it worth the cost?
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,441 Posts
GM changed to all DEXRON-VI in mid-2006. It is now used as replacement for ALL obsolete DEXRON-III.

Exactly the same as - when your car was built the API engine oil service designation was SL or SM - those are now superseded and engine oil on the shelves is service SN.
 

·
Registered
03 STS
Joined
·
2,527 Posts
I believe the dex3 name sort of went away. U can buy trans fluid that meets dex3 specs now. Label says so. I assume there is a market for "universal" trans fluid.
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
68,441 Posts
There is a LOT of DEXRON-III on parts shelves around the world. As far as the "universal" transmission fluid thing goes, DEXRON-III and DEXRON-VI are 100% compatible and mixable frontwards and backwards.

If you mixed X quarts of -III and X quarts of -VI you would create your own "synthetic blend".
 

·
Registered
1992 Sedan Deville (186,000), 1996 Impala SS DCM (135,000)
Joined
·
14 Posts
Just dropped the pan this weekend and swapped in 4 qts of the valvoline dex/merc, 2.5 qts of the maxlife, and some lubegard red. Made a smooth transmission shift and drop into gear even smoother.
 
1 - 14 of 14 Posts
Top