Castrol Magna™ grades are a range of high quality additive-free oils possessing inherently good resistance to oxidation and good demulsification properties. Castrol Magna lubricating oils are suitable for a variety of applications such as the lubrication of bearings, spindles and, using the heavier viscosity grades, moderately loaded gearboxes. They may also be used in vacuum pumps and hydraulic systems where an&aposISO HH&apos fluid type is required. Magna lubricating oils are available in a range of viscosities from 320 cSt for gear lubrication down to 2 cSt for use on fine clearance high speed spindles. The Magna range is fully compatible with nitrile, silicone and fluropolymer seal materials. Magna is classified as follows: ISO 6743/4 - Type HH.