NV4500 Castrol SynTorq?

[EMoroney]

I am due for a transmission fluid change in my NV4500 in my ‘95 CTD. Many years ago I purchased a couple gallons of Castrol Syntorq from Standard Transmission. Well, I am out and need to source some more. Since the beginning of December, I have written 3 emails to the 3 sales associates listed on their webpage for contacts and so far I have heard ZERO. I have also left a voicemail and still heard back ZERO. Does anybody know if Standard Transmission is still in busy or have they forgot to pay the bill? In the most recent TDR, they have an advertisement page.

Regardless if they never contact me, does anyone know where to source the Castrol SynTorq (if it even still exists)?
I have been doing some research and have heard the name may have changed to Castrol SynTrans 75W-80. Any truth to this? Where do you find this stuff if so?

Appreciate any help and Happy holidays to all you folks

Steven

 

[Chief USA]

You might read this

https://mopar1973man.com/topic/11475-nv4500-fluid-no-longer-produced/

 

[BigPapa]

GM 19369226 (ACDelco 10-0114) replaces the original GM 12346190, which was the same as the Mopar 4874459. It is readily available.

My personal choice is Amsoil MTGPK-EA Manual Transmission & Transaxle Gear Lube 75W-90 which used to be just Amsoil MTG.

By the way, all this has been covered over and over for years.

 

[Cummins12V98]

I changed from whatever previous owner used on my 98 12V 5 speed to AMZ/OIL and noticed a big improvement in ease of shifting.

 

[GAmes]

I bought the last gallon jugs of Standard Transmission's inventory a long time ago. They now use Amsoil. If I still had an NV4500 I would use the GM oil, easily found on Amazon. I used both and liked the syntorq better.

 

[EMoroney]

Thanks for all the replies and updated info.

 

[Matt42]

This is what I do. GM used the NV 4500 behind the 454 gasoline V8 and the ghastly 6.5 L diesel in the 1990s.

I bought the last gallon jugs of Standard Transmission's inventory a long time ago. They now use Amsoil. If I still had an NV4500 I would use the GM oil, easily found on Amazon. I used both and liked the syntorq better.

 

[Killer223]

i'll be running this next.
https://www.valvoline.com/our-products/grease-gear-oil/synchromesh-mtf

 

[AH64ID]

i'll be running this next.
https://www.valvoline.com/our-products/grease-gear-oil/synchromesh-mtf

Syncromesh is not NV4500 fluid. It’s what’s used in the NV5600, NSG360, and others... but not the proper fluid for your standard GL-4 75w-90 transmission.

 

[SAndreasen]

I went with red line synthetic that’s covers the dodge gm part number and I Like the shift quality better than the syntorque no matter what you do do not let the counter man con you into anything that doesn’t have the dodge gm part number for the spec of oil he’s trying to sell you it sill not work period
https://torqueking.com/product/9002...l-transmission-oil-by-red-line-50504-1-quart/

 

[BigPapa]

I went with red line synthetic that’s covers the dodge gm part number and I Like the shift quality better than the syntorque no matter what you do do not let the counter man con you into anything that doesn’t have the dodge gm part number for the spec of oil he’s trying to sell you it sill not work period
https://torqueking.com/product/9002...l-transmission-oil-by-red-line-50504-1-quart/

 

[Chief USA]

I went with red line synthetic that’s covers the dodge gm part number and I Like the shift quality better than the syntorque no matter what you do do not let the counter man con you into anything that doesn’t have the dodge gm part number for the spec of oil he’s trying to sell you it sill not work period
https://torqueking.com/product/9002...l-transmission-oil-by-red-line-50504-1-quart/

Redline is what I decided to try in the wife's truck. In this case her truck has an NV5600 that had a very fussy 3rd gear syncro and the Redline seriously improved the 3rd gear shift as well as the overall shift qualities of all shifts & behavior of the transmission. In my truck I decided to try a 50/50 mix of SAE 50 and Amsoil Syncromesh base on a recommendation I got from Cody @ SuperStick Transmission. This 50/50 works very nicely IF you are in a warm climate like Texas but DEFINITELY requires some warm up time in colder climates as the shifts are rather stiff until the oil warms up. The next transmission oil change, I will probably put Redline in.

Pennzoil Synchromesh worked "OK" but no where near as good as the Redline.

 

[Killer223]

Syncromesh is not NV4500 fluid. It’s what’s used in the NV5600, NSG360, and others... but not the proper fluid for your standard GL-4 75w-90 transmission.

what do you suggest i get? have access to the swepco 50wt. think that's a good option? or ??

 

[AH64ID]

what do you suggest i get? have access to the swepco 50wt. think that's a good option? or ??

Personally I would go with the Amsoil or Redline fluids, with trying the Amsoil first. Their fluids have always worked well for me.

 

[BigPapa]

GM 19369226 (ACDelco 10-0114) replaces the original GM 12346190, which was the same as the Mopar 4874459. It is readily available.

I apologize, but the ACDelco number I posted above is incorrect. It’s actually ACDelco 10-4119.

 

[Killer223]

Personally I would go with the Amsoil or Redline fluids, with trying the Amsoil first. Their fluids have always worked well for me.

The MTG? same one you had me run in my G56?
or this one?

https://www.amsoil.com/p/manual-transmission-transaxle-gear-lube-75w-90-mtg/

 

[BigPapa]

Yes, that’s the correct fluid for the NV4500. It’s the MTG in a new package.

 

[AH64ID]

The MTG? same one you had me run in my G56?
or this one?

https://www.amsoil.com/p/manual-transmission-transaxle-gear-lube-75w-90-mtg/

Yes, same one as the G56.

 

[Chief USA]

This chart may either help clarify some questions or make them as clear as mud.

https://mopar1973man.com/topic/12814-nv4500-oil/?page=2

 

[Killer223]

Yes, same one as the G56.

the reason i mentioned the Valvoline product is because this web site.
https://highgeartransmission.com/wp-content/uploads/2018/07/HG-FLUID-CHART-2018.pdf
They rebuild these transmissions and recommend the Valvoline product.

Just and FYI.