question about tranny fluid

[talkeddelta8]

ok ive heard to different things about this. i drained my tranny fluid today and was going to put in 75w 90. and the fluid was red when i took it out. so i called the dealer and they said that the fluid is dextron 6. so im like wtf the dealer says dextron 6 but all everybody else says 75w 90.
what has everybody else used.
by the way the dextron 6 fells like it working the shifts are like butter.
thanks

[dogturd21]

I got this off of the Amsoil Website - they have a pretty decent cross reference guide for almost everything. According to this source, it specifies Synthetic ATF fluid, but also specifies a Saturn Part.

There are also many threads on this already- here is one-
Thinking of swapping out my Transmission Fluid...

I believe I tracked this down a while back and found that the Saturn part is really a Castrol Synthetic ATF, so using Dexron 6 (there is actually a 6? did not know that) sounds right. Here is the equivilent Amsoil part-
http://www.amsoil.com/catalog.aspx?code=ATF16-EA


LUBRICANTS & FLUIDS
Engine Oil
Grade 1......API*
SAE 0W-30 Synthetic Signature Series Oil
SAE 5W-30 Synthetic Motor Oil
SAE 5W-30 XL Synthetic Motor Oil
All Temps......5W-30
Manual Transmission,Getrag.....GLS[1]
Synthetic Automatic Transmission Fluid
Manual Transmission,MU3.....SLF[2]
Synthetic Automatic Transmission Fluid
Fluids
Brake Fluid.....HB
Series 500 High Performance DOT 3 Brake Fluid
Clutch Fluid.....HB
Series 500 High Performance DOT 3 Brake Fluid

1. GM recommends Part No. 88861800 (Canada 88861801)
or equivalent for manual transmission, transfer
case applications.
2. SLF is Saturn part no. 21018899. Do not use any other fluid.


CHASSIS LUBRICATION
0 Fittings, 0 Plugs



CAPACITIES
Engine, with filter..........6.0 quarts[1]
Cooling System, Initial Fill..........7.4 quarts
AMSOIL Antifreeze and Engine Coolant

Manual Transmission, MU3..........4.0 pints
Manual Transmission, Getrag..........3.6 pints

1. After refill check oil level.


TORQUES
Oil Drain Plug.....18 ft-lbs
Manual Transmission Getrag
Fill Plug.....28 ft-lbs
Drain Plug.....28 ft-lbs
Manual Transmission MU3
Fill Plug.....37 ft-lbs
Drain Plug.....37 ft-lbs

[Dainslaif]

I've never heard of Dextron 6. I just used 2 quarts of Castrol's 75w90 full synthetic. Shifts fine.

[dogturd21]

Originally Posted by Dainslaif

I've never heard of Dextron 6. I just used 2 quarts of Castrol's 75w90 full synthetic. Shifts fine.

There have been a few times that I really dug in and researched this, and I think using a 75w-90 gear oil is probably the wrong thing to use. Since its gear oil, the weight clasification cannot be directly compared to engine oil which is why it does not seem as thick as you would expect. That said, its probably much thicker than a Synthetic ATF. Do you get any sticky shifts ? Minor gear grinding ? Any adverse behavior ?

[Plastic]

75w90 will work fine as long as it meets GM's GL-4 requirement (not sure if Castrol's is)

When I had my Centerforce put in the guy put in Royal Purple Max ATF. But after reading This thread I changed it out for R.P. Max Gear. And for the past 4 months with the new clutch and fluid in, she has been shifting super smooth.

[Pierre]

From Wop himself.

http://www.redlineforums.com/forums/584985-post56.html

Pierre

[hawlyns711]

got mine from the dealer, the way it should be

[Watts-Up]

Yep, use the synthetic stuff from Saturn.