Up to 75% of engine wear happens while your engine warms up. When the engine stops oils drain off critical engine parts, however Castrol Magnatec’s intelligent molecules don’t, they cling to the engine like a magnet providing an extra layer of protection ready to protect from the moment you turn the key.


Castrol Magnatec 10W-40 A3/B4 is suitable for use in Automotive gasoline and diesel engines where the manufacturer recommends an API SL/CF, ACEA A3/B4, A3/B3 or earlier specification 10W-40 lubricant.

Castrol Magantec 10W-40 A3/B4 is also approved for use in VW group vehicles that require a VW 501 01 / 505 00 specification 10W-40 lubricant and Mercedes vehicles that require an MB-Approval 229.1 10W-40 lubricant.

Typical Characteristics


Method Units Castrol Magnatec 10W-40 A3/B4
Density @ 15C, Relative ASTM D4052 g/ml 0.86
Viscosity, Kinematic 100C ASTM D445 mm²/s 14.3
Viscosity, CCS -25C (10W) ASTM D5293 mPa.s (cP) 6750
Viscosity, Kinematic 40°C cSt ASTM D445 cSt 93
Viscosity Index ASTM D2270 None 155
Pour Point ASTM D97 °C -33
Flash Point, PMCC ASTM D93 °C 199
Ash, Sulphated ASTM D874 % wt 0.96

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