BG Syncro Shift II from Optimum Performance

Updated Recommendations From BG Products

I have included a screen shot from my BG Application Guide. They Actually are recommending the 75W-140 for the Rear Axle.

To Help Understand The Part Numbers Listed:
792 = BG Syncro Shift II
752 = BG Ultra Guard Heavy Duty 75W-140
328 = BG LSII Limited Slip Axle Additive Concentrate

We carry the 753 BG Ultra Guard Heavy Duty LS 75W-140 Products which is the 752 with the Limited Slip additive already added in. This eliminates a separate product, service step and the chance for the incorrect mix ratio.

The reason they specify 752 is because Ford Factory Fluids always require separate additives. As seen below the 752 meets the Ford Spec. for 75W-140. The 753 includes the additive so it 'technically' doesn't meet the spec even though it's the same thing once you add the LS additive to the 752.

"BG Ultra-Guard® Heavy Duty will withstand the punishing effects of extreme heat and arctic conditions and is one of the few polymer-free gear lubricants to meet the stringent requirements of Ford engineering spec WSL-M2C-192-A. It can be used in all conventional and limited slip differential hypoid gear rear axles."

If you look at the Ford Product Information for the 75W-140 it says "It is recommended for conventional and limited-slip differentials of passenger cars, light trucks, vans and buses that operated under mild to severe service conditions"

So if anyone had doubts about running BG Products in the Mustang, BG stands behind it and recommends the products we offer.

Now if you are running our 75W-90 please don't panic, it's a large improvement over the factory fluid, and will be the most efficient fluid. If you plan on tracking your car obviously go with 75W-140.

Tommy, can you throw up a product on the site for the 75w-140 and additive combo?

Sub'd

I have included the spec sheets in PDF format to clear up the confusion. 752 and 753 are identical except 753 already has the Limited Slip Additive in it.

I have been running Synchro Shift II in my Mt-82 transmissions for over 3 years now. Good stuff, smooth shifting even after long session track days and much cheaper than the Dual Clutch Ford fluid. Remember to change every 8-10 track hours.
I have gone to Miller Oils 75w140 in my 2016, I have been running this in my 2011 track Mustang since 2013.
Steve

Isn't this oil way higher viscosity then say syncromax?isnt it like fear oil vs what is recomendd by ford?
Might have to try this next time, or would royal purple 75-90 diff oil be similar to this?

I went from the OEM MT-82 fluid to AMSOIL to BG and each time was a massive improvement. I am VERY impressed with the BG fluid. I thought the AMSOIL was awesome, but the BG is just perfect. I was surprised at the amount of improvement seeing as how I thought the AMSOIL was going to be as good as it got. I definitely feel better knowing that I have a higher weight in my tranny, especially being supercharged. The BG fluid is very smooth and the shift engagements seem better as well.

So has anyone tried the Royal Purple 75-90 gear oil? It says on the back it's for mauanl gear boxes. I have not tried it but might at my next change.

350Mike said:

So has anyone tried the Royal Purple 75-90 gear oil? It says on the back it's for mauanl gear boxes. I have not tried it but might at my next change.

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Do not use rear axle gear oil in a modern manual. It wil be a bad day of shifting. It does not have the additives (friction) for syncro's. You can you Syncromax(Mesh?) if you are a RP Fan, and use the 75W-90 in the rear axle.

Optimum Performance said:

Do not use rear axle gear oil in a modern manual. It wil be a bad day of shifting. It does not have the additives (friction) for syncro's. You can you Syncromax(Mesh?) if you are a RP Fan, and use the 75W-90 in the rear axle.

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Isn't the BG a 75-80 GL-4 gear oil? RP 75-90 Max Gear GL-4 does have friction modifiers in it. It says for LSD and Manual trans. I'm not a fan boy I'm just curious and seeing if others have experience.

Hi all! New member here. Recently picked up a 2016 Ecoboost, PP. MT and looking to replace the Trans Oil. Prior I had a 2015 Ecoboost with A/T.

Just confirming, [MENTION=22413]Optimum Performance[/MENTION], the following 3 will not void the warranty given they meet the specs?

792 = BG Syncro Shift II
752 = BG Ultra Guard Heavy Duty 75W-140
328 = BG LSII Limited Slip Axle Additive Concentrate

Or are BG basically saying _they_ meet the specs, but it hasn't been confirmed by Ford? I ask because my current car is a lease. Though I do want to keep this beauty, there's a chance I may not, as work may have me head back to my home city (Auckland, NZ) end of next year, so want to make sure I keep within the warranty. I am tempted to step out of it for the Transmission given BG's guarantee; but also wanted to check if it only holds true when you get a BG certified mech to service it, or does it still hold if you're just using their oil and you install it yourself?

I am struggling to understand why people are asking about using RP and Amsoil in BG's thread?

Surely it can be seen from the amount of people who have gone from stock to RP and then to BG or from stock to Amsoil and then to BG, they all say the same BG offered a further improvement over RP and Amsoil.

Just go with the BG guys, it is totally awesome stuff and the kit they provide makes the change really easy.

350Mike said:

Isn't the BG a 75-80 GL-4 gear oil? RP 75-90 Max Gear GL-4 does have friction modifiers in it. It says for LSD and Manual trans. I'm not a fan boy I'm just curious and seeing if others have experience.

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Again, I strongly DO NOT recommend running RP Max-Gear in any Modern Manual Transmission especially the MT-82. I can not fathom why RP lists it as a "Warranty Compliant Recommendation"

The viscosity at 104F is off the charts...because it is a gear oil. The RP Synchromax is the only product they should be the recommending for the transmission. I do not understand why this product does not have an API rating, which may be due to it being a modified ATF. That is purely speculation on my part but it does align with a Corvette track Customer that ran it informing us that after switching to BG SS II his "gear whine" went away.

Max-Gear has the additives for Limited Slip Clutches, in the rear axle not syncro's in a modern transmission. This will work fine in your rear axle.

I have included all the spec sheets. You will see the BG Syncro Shift II and RP Synchromax line up very close to each other. That said, BG SS II has been used to replace RP Synchromax and feedback from both Mustang and Corvette Customers has been that they experience much better shifting almost immediately.

It's your investment, you can try any product you want but I strongly recommend that you DO NOT use Rear Axle lube in the transmission.

I hope this helps.

blitzzfury said:

Hi all! New member here. Recently picked up a 2016 Ecoboost, PP. MT and looking to replace the Trans Oil. Prior I had a 2015 Ecoboost with A/T.

Just confirming, [MENTION=22413]Optimum Performance[/MENTION], the following 3 will not void the warranty given they meet the specs?

792 = BG Syncro Shift II
752 = BG Ultra Guard Heavy Duty 75W-140
328 = BG LSII Limited Slip Axle Additive Concentrate

Or are BG basically saying _they_ meet the specs, but it hasn't been confirmed by Ford? I ask because my current car is a lease. Though I do want to keep this beauty, there's a chance I may not, as work may have me head back to my home city (Auckland, NZ) end of next year, so want to make sure I keep within the warranty. I am tempted to step out of it for the Transmission given BG's guarantee; but also wanted to check if it only holds true when you get a BG certified mech to service it, or does it still hold if you're just using their oil and you install it yourself?

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Warranty: It has to be proven to cause a failure. I have not heard of a single documented denial based on fluid used in an MT-82. Several Ford and GM dealers sell BG Products in their service departments. BG Synro Shift II has a long history and again, no documented 'cause of failure' that we are aware of. BG Lifetime Driveline Service is a program that we are not involved in, obviously we ship product all over the world so we are not controlling the installation. The products we offer are the same ones used in the service centers. Installing the fluid yourself is not the issue as much as it needs to be proven whatever product was installed was the cause of the failure.

A very small number of people have had "bad" transmissions that were not going to be repaired with a fluid change. It is impossible to say if it was due to how it was operated, assembled or if the syncro break-in additve was properly added at the factory that caused these issues. Ford has had a history of MT-82 issues which seem to be very minimal in recent years. If you have an existing issue I always recommend bringing it in to Ford so it's documented. Many shifting issues go away with time (mileage) and a majority go away with a fluid change.

Gibbo205 said:

I am struggling to understand why people are asking about using RP and Amsoil in BG's thread?

Surely it can be seen from the amount of people who have gone from stock to RP and then to BG or from stock to Amsoil and then to BG, they all say the same BG offered a further improvement over RP and Amsoil.

Just go with the BG guys, it is totally awesome stuff and the kit they provide makes the change really easy.

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Thank you for all the referrals [MENTION=13598]Gibbo205[/MENTION] !!! :cheers: