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⚙️ Drive Smooth, Stay Ahead – The Fluid That Works as Hard as You Do
Castrol Transmax DEX/MERC is a premium full-synthetic automatic transmission fluid engineered for both stepped and continuously variable transmissions. It offers exceptional friction durability, high-temperature oxidation resistance up to 175°C, and superior copper corrosion protection. Compatible with a broad range of vehicles globally, it enhances transmission performance and longevity, backed by Castrol’s trusted Smooth Drive Technology and a strong user approval rating.
| ASIN | B00DILUBL6 |
| Best Sellers Rank | #14,243 in Automotive ( See Top 100 in Automotive ) #46 in Transmission Fluids |
| Brand | Castrol |
| Brand Name | Castrol |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 2,239 Reviews |
| Global Trade Identification Number | 00079191335208 |
| Included Components | 1 Gallon Jug of Automatic Transmission Fluid |
| Item Form | Liquid |
| Item Type Name | Automatic Transmission Fluid |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Castrol |
| Material | Calcium Sulfonate, Molybdenum Disulfide |
| Model Number | 03520 |
| Number of Items | 1 |
| Package Information | Bottle |
| Part Number | 03520 |
| Recommended Uses For Product | Automotive |
| SAE J300 Viscosity Grade | 5W-30 |
| Specific Uses For Product | Automatic Transmission Maintenance, Vehicle Compatibility, Performance Improvement |
| UPC | 079191335208 |
| Unit Count | 128.0 Fluid Ounces |
| Upper Temperature Rating | 175 Degrees Celsius |
| Viscosity | 5w-30 |
| Warranty Description | 3 months |
B**N
Perfect in the Merc 722.n Gearbox.
This stuff meets the Dexron II and III requirements my Mercedes-Porsche auto gearbox demands. Many more modern "works in anything" fluids are nothing but problems for 'vintage' euro GT cars. This one works perfectly. I'm very happy that this is still available. A few local stores stock it, but at a cost premium. Thank goodness Jeff B. had an old Mercedes, and keeps bottles of this for me in his warehouse/garage.
W**I
Works.
Honestly can any of us really review this product? Without doing an oil analysis after thousands of miles I can’t tell you if it’s good or not. What I do trust is the brand, I know the fluid is the right spec and I liked the price. That’s what I bought it. I’m using it for DOT III power steering fluid if that matters.
M**F
Great Trans Fluid
Great stuff!
A**N
good oil
Works well
R**D
2005 Honda Odyssey Touring
I used this for the transmission fluid flush on my 2005 Honda Odyssey Touring with 221k miles. Unknown when last transmission fluid change was, but it's part of Honda's maintenance schedule - so ~30-60k miles. I ran this fluid for a few weeks (~500 miles) before flushing it out and putting in the Honda OEM ATF. In the Odyssey, you cannot drain all of the fluid out the first drain (some left in cooler, lines, solenoids). The recommended total "flush" is to fill/drain 3x times (I only did 2x). On the 2x fill I used the Honda OEM ATF, since the cost is reasonable for my budget. I cannot tell a difference in shifting/drive-quality between Honda OEM ATF and this.
J**Z
Muy bueno
Muy bueno
R**G
Car part
Very useful.
C**M
great fluid
so far this is the best mercon fluid ive found, its given me the lowest trans temps of any fluid ive used in my 7.3 dually no matter what im towing
Trustpilot
2 months ago
2 days ago