Mike TexaSS

I saw a relpy noting on how smooth the car shifted after changing the manual transmission fluid. So what fully synthetic oil can i use and what fluid can i get from a jiffy lube or o rileys or autozone??

wwashing

You want to use ATF (Automatic Transmision Fluid), not MTF. Check you owners manual for the specifications, you can use any Synthetic that meets that standard. I've been using Redline D4 ATF for 3 years. Mobile One also makes one that meets the specs.

Mike TexaSS

But redline makes a MTF fluid i saw it at my buddies shop yesterday so why would you use a automatic fluid in a manual? Just wondering no flames here!

mbtc5vette

Because the owner's manual says so. Newer MT's are using ATF instead of gear oil - probably for mileage reasons but there may be others. Putting gear oil in would surely invalidate your warranty. Don't know if it would really break anything. Anyway, use synthetic ATF. Mobil1 ATF works for me.
:cheers:

IMQUIK

AMSOIL ATF!! :yesnod:

SoCal C5

The syncros in an MN6 are different than the transmisions of yesterday. Your MN6 has cone shaped syncros with a friction material much like what is used on the clutches of an automatic. Older transmisions had splines that meshed together.

The friction material on the syncros and no doubt Mileage/efficency are the main reasons for the use of ATF.

RWBJR

I would use Amsoil's ATF product. I use Amsoil fluids in all my vehicles; oil, transmission, and gear lube. Check out the preferred membership. For $10 you get a six month membership and you'll receive approx 15% discount on these products.

kewlbrz

Redline D4-ATF :yesnod:

Jumper11

I have 45K on my 2006 Manual Transmission and wanted to change out the fluid. What does the forum recommend? Thanks

Georgies

I used royal p. No probs here...

JBB

Mine called for: MM6 (6-SPD) GLS All TEMPS TA1
TA1: GM recommends P/N 88861800 (Canada 88861801) or equivalent for manual transmission, transfer case applications.

That crosses to Dextron III (Non-synthetic)

<cut & past from GM TSB>
If fluid part number 88861800 U.S. (88861801 Canada) is unavailable when servicing a manual
transmission or transfer case, Dexron III can be used in it's place. DO NOT use Dexron VI in place of
the manual transmission fluid in any manual transmissions or transfer cases as a failure may result.

Spaceme1117

I have been running Royal Purple SYNCHROMAX and have no complaints.

I have always heard Redline ATF is great also.

Bill Curlee

You can NOT beat AMSOIL Torque Drive ATF. Best stuff I have used so far!

I KNOW it works! IT WORKS VERY WELL! Its compatable with early and late C5 MN6 Transmissions and C6!!

Bill

Jumper11

I went to advance auto and tried to find Dextron III with H requirement. No longer available. It's replaced by Dextron VI synthetic. States right on the label "replaces dextron III with H requirement. I changed it and seems to be smoother. Let me know if this is not recommended. I know the C5 manual in some years had paper bushing and synthetic was not recommended. Thanks in advance.

Paul 75 L82

Royal Purple Synchromax

jjc508520

I met an Amsoil distributor at Carlisle last year and to my surprise he responded to my emails about the C5 MN6 trans fluid. An excerpt from his email appears below:
----------
For all GM Transmission specs - Dexron VI states all previous GM specs are obsolete. Meaning if your owner's manual calls for a Dexron III or IV, you use Dexron VI.

AMSOIL's ATL is the recommendation for these specifications. (ATF Signature Series Fuel-Efficient)

The Torque Drive Transmission Fluid was formulated Allison products, and covers the TES289 and TES389 specifications.
----------
The rep has said he will be at Carlisle again this year and will have ATF on-hand - I'll be bringing some home with me...
----------
Jerry Mikielski, Jr.
GK Synthetics, LLC
Independent AMSOIL Dealer
DEF Distributor
(570) 239-5330
Http://amsoil.gksyn.com

Bill Curlee

An EMPTY new MN6/MN12 manual trans takes 4 qts of ATF. If you drain and fill yours, you will use 3.75/ish qts!

I also use the AMSOIL Products and am very happy. AMSOIL just changed some of their product lines and now recommend that signature series ATF. TRUST ME,,, The Troque Drive ATF worked and worked very well! Even in the Early MN6 trans!

Recommend you change out the diff 75/90 at the same time. Get the GL-5 stuff that has the limited slip additive in it.

Bill

CaliforniaJack

How much GL-5 Diff fluid do I need for a change?

feeder82

2 qts

The Wrench

Just recently drained the Amsoil torque-drive and filled with the new signature ATF. The new fill actually seems a bit better; although the torque-drive was very good.

DG