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🛠️ Keep your transmission shifting like new—because your ride deserves the best.
Castrol TranSynd 668 is a premium synthetic automatic transmission fluid offering superior gear protection, extended anti-shudder and clutch durability, excellent corrosion and foam resistance, and outstanding thermal stability. Its universal fit makes it ideal for a wide range of transmissions including Allison, NP, and Magna, ensuring smooth, reliable performance and longer transmission life.
| ASIN | B095SZB2DK |
| Best Sellers Rank | #6,047 in Automotive ( See Top 100 in Automotive ) #26 in Transmission Fluids |
| Brand | Castrol |
| Brand Name | Castrol |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 1,075 Reviews |
| Item Form | Liquid |
| Liquid Volume | 1 gallons |
| Material | Synthetic |
| Number of Items | 1 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Number | TES 668 |
| Recommended Uses For Product | Automotive |
| UPC | 079191219164 |
| Unit Count | 128 Fluid Ounces |
R**G
Great deal for oil
Just what I needed for my truck and will buy more to complete my transmission oil change!
M**5
Only fluid to use in any Allison transmission
Started using Tes fluids 8 years ago in my 2005 duramax. Trans developed a shudder and jerking motion going downhill in cruise control. Called Allison tech support. Was told Dex VI wasn't good enough to protect 1000 series trans internals and seals. Changed to Tes 295 and all trans symptoms disappeared. Did forward system flush to get all Dex VI out of the system. 4 gal. Now I'm using 668. 322,000 mi and the trans shifts like new. Can be used in NP and Magna 263 and 261 transfer cases . I do a pan drain every 2 years and canister filter every 12 mo. The cleaner the fluid the cooler it runs.
P**E
Good stuff !
Top shelf & recommended transmission fluid for Allison 1000 transmissions. Never use anything else and Amazon has the best deal.
R**1
Good price, fast delivery
As expected, we'll packaged.
T**A
Husband approved
Husband likes it. Good buy
C**E
👍👍👍👍👍
Great stuff!
N**.
Good
Good
A**Y
As title says
D**E
Allison 1000
This is the oil the Allison 1000 calls for
K**W
It's the best for Alison transmissions
My chevy is 7 years young now and I swap out the external filter yearly and change out the oil every 2 years. Never ever had a problem using this oil. And I only use Alison filters BTW
B**Y
Fast and good service
Everything was fine as described
E**T
Fully synthetic only way to go
I’m giving it 5 stars because it’s fully synthetic, I’m only expecting the best, the trailer will be the test
K**R
Allison transmission filter & fluid.
Excellent product, good delivery.
Trustpilot
3 weeks ago
3 days ago