Group III Hydroprocessing and Refining:
Group III base oils are subjected to the highest level of mineral oil refining of the base oil groups. Although they are not chemically engineered, they offer good performance in a wide range of attributes as well as good molecular uniformity and stability. They are commonly mixed with additives and marketed as synthetic or semi-synthetic products. Group III base oil products have become more common in America during the past decade. Examples of Gr. III oils are Mobil 1, Castrol, Pennzoil, etc Group IV = Chemical Reactions( All polyalphaolefins-PAOs ):
Group IV base oils are chemically engineered synthetic base stocks. Polyalphaolefins (PAOs) are a common example of a synthetic base stock. Synthetics, when combined with additives, offer excellent performance over a wide range of lubricating properties. They have very stable chemical compositions and highly uniform molecular chains. Group IV base oils are becoming more common in synthetic and synthetic-blend products for automotive and industrial applications. Examples of Gr. IV PAO's are Amsoil entire line except for their XL oils and the PCO Synthetic Blend diesel, Red Line and Royal Purple. Group V = All others not included in Groups I, II, III or IV (Esters):
Group V base oils are used primarily in the creation of oil additives. Esters and polyolesters are both common Group V base oils used in the formulation of oil additives. Group V oils exhibit a wide variety of properties specific to each individual oil's formulation. Group V base oils are generally not used as base oils themselves, but add beneficial properties to other base oils.
Last edited by Z15; 06-13-2008 at 02:16 PM.
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