Blown1987

Is this a good choice for better fluid? 700r4

Aardwolf

It's very costly and not needed unless you're going to get the trans really hot. Through track use normal ATF didn't hold up for me, road course = 230-280° temps. Only 160° street use!

leesvet

I use it.
After a repair that cost me $2000 for a partial rebuild, and after reading fleet reports that proved that using syn tranny fluid all but ended failures, I switched. yeah, the cost adds up quick. Seems like it was $5-7 a qt. If you drive in extremes or hot climates I think its a MUST. I also installed a cooler to help. Trans fluid gets changed about every 2 yrs. Its about that time before summer.

93 ragtop

I don't know about the Valvoline fluid, I use the Mobile syn ATF. My transmission mechanic swears by the syn. fluids.

Blown1987

Thanks for the prompt advise. Just had a costly rebuild and bought an expensive torque converter so the last thing i wanna do is skip out on fluid when a couple extra bucks will help the longevity. I was debating between the Valvoline and the mobil syn but the Valvoline had gm stamped on the top and just had me sold. ( I know it sounds stupid but never bought fluid before )

superjet701k

Mobile one says GM on it also just did my 96

383vett

For the track, Amsoil non slip racing fluid is the best I have come across. Last year a whole season of racing and no blowups or slippage convinced me. I'm using Amsoil in my tow suv also. It's good stuff.

Cliff Harris

Valvoline makes several synthetic trans fluids. They are specially formulated to meet the various manufacturer's specs. The GM version is called Dexron (I think it's Dexron IV). They also make Mercon for Fords and something-or-other for Chryslers.

I was using it for a while but switched back to regular because of the cost. My car is a daily driver and never raced (any more... ;-). I'll die of old age before it would make a difference.

BGZQ8

It's Dexron VI.

C66 Racing

Though GM claims the relatively new Dexron VI fluid (which is also a specification) is backwards compatible with the older Dexron III (also a spec which GM no longer licenses but many aftermarket vendors continue to make), I personally don't use Dexron VI fluids in my own cars that originally required Dexron III.

Dexron VI is a better fluid than Dexron III (now GM part 88861800) if you buy the GM brand as many portions of the Dexron VI spec require a better basestock. But if you get aftermarket fluids with good synthetics basestocks, then the differences between the two fluid spec basestock are not material and other portions of the spec are. In my opinion, one of the key differences is that Dexron VI has a lower viscosity than Dexron III. I believe this is to help GM's CAFE. I personally don't care about the few percent difference I might get in mpg with going to a lower viscosity fluid and would prefer the better protection provided by the viscosity of the original Dexron III spec.

AMSOIL makes both in good synthetic basestocks:
AMSOIL Multi-Vehicle ATF (Product Code ATFQT)(Dexron III spec)
AMSOIL Low Viscosity Universal Automatic Transmission Fluid (ATL) (Product Code ATLQT)(Dexron VI spec)

I personally use the first one for my older cars that originally required Dexron III.

More than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.