850R transmission fluid question, Mobil 1 3309 reg or syn?

TERINASSsydwayz · Post by **TERINASSsydwayz** » 18 Jun 2012, 11:57

1997 855R a/t 184k, unknown previous trans hx, about to do timing belt / PCV system / oil cooler hose fixes / seafoam engine and trans tune / inspect turbo and manofold / clean all the oil out of the intercooler/intake tract / Snabb phenol intake spacer / silicone vac elbows -- trying to complete stage Zero and then find out if the smoking is fixed or if i have to do VS seals.

So i HAVE been searching and my head is spinning, i know i need 3309 - and Mobil 1 seems to be the hands down go to recommendation but also synthetic seems to be preferred.

Searching online i have found a good site (referred to on one of the many threads read) and they offer very good pricing and these are links for the fluids desription:
thelubricantstore.com MOBIL-ATF-3309
thelubricantstore.com MOBIL-Synthetic-MULTI-VEHICLE-ATF

BOTH are stated as being suitable for vehicles with following requirments:
Toyota T-III, T-IV JWS 3309 Volvo 97340

The thing that throws me off is that the regular has a description that specifically states "Exceptionally High Performance Fluid Designed Specifically to Lubricate Aisin-Warner Slip Controlled Lock-Up Automatic Transmissions."

a little clarification would be GREAT, with RECENT experience since one thing i read was about how M1 "lost" it's 3309 designation. .............so f*n confused!!!!

THANKS

Post by **jblackburn** » 18 Jun 2012, 12:35

You don't need 3309 for a 4-speed. You can use it, but it's not required.

I'm not sure what the price is on Mobil's 3309, but if the full synthetic isn't too much more (as I recall when I did it, it was $8/qt), it's amazing stuff. Been using it in my car for 70,000 miles (one change in between at 40K on the fluid) and the transmission's still going strong.

BigRed · Post by **BigRed** » 18 Jun 2012, 12:41

TERINASSsydwayz wrote:i know i need 3309

My understanding is that all US Spec AT 850's have the AW50-42 LE and use Dex/Merc. As for Mobil 1 you could use Mobil 1 Synthetic ATF.

TERINASSsydwayz · Post by **TERINASSsydwayz** » 18 Jun 2012, 12:58

case/12

$73.89 M1 reg 3309
$67.08 M1 Synthetic MOBIL MULTI-VEHICLE ATF

wow, they are having a sale on M1 5w-30 1x6 for $23.41 ea. 4 cases here i come!

TERINASSsydwayz · Post by **TERINASSsydwayz** » 18 Jun 2012, 15:11

SCREW IT! i'm going to go with T-4 toyota atf fluid. $ 5.50 @ local dealer

Post by **MoVolvos** » 18 Jun 2012, 16:38

TERINASSsydwayz wrote:SCREW IT! i'm going to go with T-4 toyota atf fluid. $ 5.50 @ local dealer

Mobil 1 (3309) is and makes Volvo's and Toyota's Fluid. It is not Synthetic however as Mobil has a Synthetic. If you are so inclined to read the Post below I'd tried to explain why they made the recommendation "Exceptionally High Performance Fluid Designed Specifically to Lubricate Aisin-Warner Slip Controlled Lock-Up Automatic Transmissions." rather than say ONLY USE.

https://www.matthewsvolvosite.com/forums ... =8&t=49336

Magnuson-Moss Warranty Act of 1975
https://www.matthewsvolvosite.com/forums ... =4&t=49388

Blessings,
BKM
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