Quote:
Originally Posted by skyship007
Sludge forms when the oil runs out of detergent additives, as apart from a direct cleaning effect they keep what is mostly Carbon in suspension. Once they run out the Carbon forms clumps that tend to finish up in the sump and various nook and crannies. Ultimately sludge blocks the oil pump intake screen causing a loss of oil pressure. More expensive oils normally contain more detergent additives, so they will last longer.
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I'm struggling to get my head around how an oil can be a good lubricant when it includes detergents/abrasive cleaners within, how can it successfully do both, do you have a links I could read?