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  • ...rticles. The oil pump powered by the engine pumps the oil through the oil filter. Oil filters can be a ''full flow'' or ''[[bypass]]'' type. ...distilled]] [[petroleum]]. Group III base stock is composed of [[Cracking (chemistry)|hydrocracked]] and distilled petroleum. Group IV base stock is composed of
    19 KB (3,054 words) - 08:52, 8 October 2009