Best tranny oil for 5mt with LSD

Yes, I know there are dozens of threads here about tranny fluids, however, the more I read, the more confusing it became. I have to replace my center diff bearings this weekend and, along with that, my tranny fluid. I have 73k miles and a MFactory Torsen LSD. My plan is to just go with Extra-S. Good idea? Bad idea? Other options? Any help would be great.

I used Amsoil Products in my cars:

Severe Gear

Automatic Transmission Fluid

 

And they recommend Severe Gear for Manual Tramsmissions

You'll also read where I'm refilling my 5mt in my wagon with Amsoil Severgear and I have that in my 09 Spec B also 6mt and the rear diff.

 

I did just put one of the 5 qt's of Motul 300 in the rear diff of the wagon.

Please don't do the stupid cocktail mix.

 

Extra-S is a clear first choice.

How much do you really stand to gain from trying a cocktail? Plenty of people say the Subaru stuff works, that's what I'd use.

 

How many times has BAC5.2 changed his tranny fluid that he can clearly recommend the "cocktail" over one or two other brands of gear oil?

If you have issues with your tranny then the cocktail can help.

 

Having done the Extra-S and Amsoil Severgear. I think the Amsoil shifts as good if not better.

Thanks for all the replies. Based on everything I am hearing and the fact that I have zero issues with my tranny as far as shifting, grinding, etc, I am most likely going to stick with Extra-S.

 

Really, my question was more around whether or not I should consider something different due to my LSD. I was just wondering if someone would come on here and say something like "You idiot, you can't use Extra-S with your LSD. You loser!".

What did the guy's at MFactory recommend that you use ?

 

It's been a few years but I can't remember the name's of the guy's there from our Honda day's. I know my son was talking with them 4/5 years back.

What did the guy's at MFactory recommend that you use ?

 

It's been a few years but I can't remember the name's of the guy's there from our Honda day's. I know my son was talking with them 4/5 years back.

 

It's been a few years but I can't remember the name's of the guy's there from our Honda day's. I know my son was talking with them 4/5 years back.

 

Directly from their website FAQs:

"We highly recommend the use of our Torco Transmission Fluid when our gears are installed with a stock differential or our Limited Slip Differentials. While it is not a necessity, we observe a transmission fluid change every 2-3 Engine Oil changes. However, this is dependent on your actual mileage and frequency of usage in competition environments"

 

and

 

"IMPORTANT NOTICE: DO NOT use Gear Oil in your Honda Transmission. Doing so will cause more damage than good, especially the expensive Synthetic/Performance Gear Oils. Please click here for further information. "

 

Looks like the gear oil cocktail is out. Anyone here have any experience with Torco?

How much do you really stand to gain from trying a cocktail? Plenty of people say the Subaru stuff works, that's what I'd use.

 

How many times has BAC5.2 changed his tranny fluid that he can clearly recommend the "cocktail" over one or two other brands of gear oil?

 

I've had my hands on the guts of literally thousands of Subaru gearboxes.

 

I'll have to see if I can dig up the picture of the 55 gallon drum full of broken gears we'd fill monthly.

As for what fluid to use, I'll continue recommending the cocktail I've been recommending for almost a decade. With a helical front diff, I'd typically run 50/50 Shockproof to Motul.

 

There's nothing wrong with running Extra-S, if you'd prefer to use a single fluid.

i just got 4 qt,s of syn power valvoline

i heard good stuff from others that rebuild trans, and diffs and thats all they use so , ive been a die hard redline user , just figured id give this a try

I've had my hands on the guts of literally thousands of Subaru gearboxes.

 

I'll have to see if I can dig up the picture of the 55 gallon drum full of broken gears we'd fill monthly.

 

In that case I defer to you!

How's the Redline stuff? Good? Bad? Im asking because i put it in mine about 1800K ago.

Which red line fluid are you referring to? I put 75w-90NS in my transmission a few weeks ago. For the first two days things felt a little funky, but ever since then its been shifting great.

I've always used and had great results w/Motul Gear300. I had there when you got the car. I also have it in my Miata too. Loves it!

Extra-S.

 

For 5MT's already eating gears/synchros we tend to use a "cocktail" of 3qts Motul Gear 300 and 1qt Redline Lightweight Shock Proof.

This,

 

http://i185.photobucket.com/albums/x40/92Si/th_DSCN5242_zps79584338.jpg

 

To protect this.

 

http://i185.photobucket.com/albums/x40/92Si/th_DSCN5296_zps1a5dd163.jpg

Where is the best place to get the Extra-S? The ole dealership?

The dealership can only get you 5 gallon drums.

 

The following vendors sell 1qt bottles. There may be more vendors that sell it by the quart, but these are the first guys that come to mind.

 

Fred beans subaru out of PA

http://www.fredbeansparts.com/subaru-75w90-extra-s-gear-and-transmission-quart-bottle.html

 

Infamous Performance out of CA

http://www.infamousperformance.net/servlet/the-612/Subaru-75W90-Extra-dsh-S-Gear/Detail

 

AZP out of NJ doesn't sell it by the quart, but they do sell it by the gallon.

http://azpinstalls.com/web/index.php/products/maintenance

Sweet! Thanks. I was having trouble finding folks to split the 5G.