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PostPosted: Thu Sep 19, 2013 11:27 am 
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Joined: Wed Aug 21, 2013 10:23 pm
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Year and Trim: 1993 Buick Park Avenue
I need to flush the old junk out and change the filter. The fluid im using is fod dextron 6 and is a full synthetic. Ok to use in my 93?

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PostPosted: Thu Sep 19, 2013 1:01 pm 
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Joined: Mon May 26, 2008 10:28 am
Posts: 459
Year and Trim: 1996 Regal Custom
Some transmissions will work fine on just about any fluid but a few will only work on the factory fill.
People that have never had any trouble switching fluids love argue about this.

My 96 Regal will only work properly with DexIII clone fluid. I tried switching to synthetic Vavoline Maxlife and the transmission started whining and having sloppy shifts after one week. I had to do a couple drain and fills with Castrol Dex/Merc to get things back to normal. I had to pick an aftermarket fluid because AC Delco no longer sells Dex III.

After going through this I will only use factory fill transmission fluid from now own.


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PostPosted: Thu Sep 19, 2013 4:45 pm 
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Joined: Mon May 10, 2010 6:11 pm
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Location: Chicago, IL
Year and Trim: 2003 SLE
Apparently Dex VI is backwards compatible.

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PostPosted: Thu Sep 19, 2013 5:00 pm 
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Location: DeKalb, IL
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Is it backwards compatible. It should work in a 4T60. Our lookup at work dictates Dex 6 for about every GM trans it lists. With the exception of old old transmissions like TH350/400 etc. I haven't looked up a 4T60 but I'd imagine it would be fine.

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91 Buick Riviera | S2 L67 swap/4T60E | 124k mi | Antelope Beige Metallic w/Tan Int | Beat-up Beater / Cool Digital Dash
92 Pontiac Bonneville SSE | L67/4T60E | 75K mi | Med Slate Grey w/ Two-Tone Grey Int. | Low Miles Time Capsule / Storage Occupant
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PostPosted: Thu Sep 19, 2013 7:48 pm 
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Joined: Tue May 27, 2008 8:53 am
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
The only concern is the additional detergents in synthetic. If your tranny is being held together by crud, then when the crud gets broke loose, your tranny will soon follow.

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PostPosted: Thu Sep 19, 2013 10:04 pm 
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Joined: Wed Aug 21, 2013 10:23 pm
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Year and Trim: 1993 Buick Park Avenue
Im pretty sure the transmission is good. Its already the second one for this car. No slippage and shifts the very best. The fluid is red, but looks a bit old and darkish. Last one went bad at 400, 000 kms and that was because trans fluid and antifreeze don't mix. :eek2:

I am getting ready to install a tcc solonoid and basically the tranny has to be dropped for this job. That is why I asked.

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09 Pontiac Vibe AWD
01 Pontiac Sunfire GTX
84 Chevrolet Citation


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