Castrol RX Super Max 15W-40 is a premium multi-purpose, heavy duty diesel engine oil, suitable for use in high speed 4-stroke diesel engines that use a broad range of fuel qualities.
It is suitable for use in on and off highway applications where API CH-4 performance is recommended and is
compatible with BS I to BS III type vehicles.
Castrol RX Super Max 15W-40:
Protects critical engine parts through effective lubrication and circulation of oil.
Maintains engine cleanliness helping to deliver reliable performance Contains cleaning agents which reduce deposits by helping displace dirt that may otherwise build up on your engine surfaces
API CH-4
Storage
All packages should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and damage to drum markings. Products should not be stored above 60°C, exposed to hot sun or freezing conditions.
Physico-Chemical properties
| Name | Method | Units | RX Super Max 15W-40 |
| Density @ 15C | ASTM D4052 | g/ml | 0.875 |
| Viscosity, Kinematic 100C | ASTM D445 | mm²/s | 14.4 |
| Viscosity, CCS -20C (15W) | ASTM D5293 | mPa.s (cP) | 6140 |
| Viscosity, Kinematic 40C | ASTM D445 | mm²/s | 111 |
| Viscosity Index | ASTM D2270 | None | 133 |
| Ash, Sulphated | ASTM D874 | % wt | 1.19 |
| Total Base Number, TBN | ASTM D2896 | mg KOH/g | 7.9 |
| Pour Point | ASTM D97 | °C | -42 |
| Flash Point, PMCC | ASTM D93 | °C | 206 |