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⚙️ Drive Smooth, Stay Ahead – The Fluid of Future-Ready Transmissions
Castrol Transmax DEX/MERC is a premium full-synthetic automatic transmission fluid engineered with Smooth Drive Technology. It offers exceptional friction durability, high-temperature oxidation resistance up to 175°C, and superior copper corrosion protection. Designed for universal use in both stepped and continuously variable transmissions across global vehicle models, it optimizes performance and extends transmission life.




| ASIN | B00DILUBL6 |
| Best Sellers Rank | #12,878 in Automotive ( See Top 100 in Automotive ) #45 in Transmission Fluids |
| Brand Name | Castrol |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,246) |
| 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 |
| Number of Packs | 1 |
| 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 Fluid Ounces |
| Upper Temperature Rating | 175 °C |
| Viscosity | 5w-30 |
| Warranty Description | 3 months |
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