Abstract
AbstractContaminants in passenger car engines are physically separated from lubricating oil by full flow oil filters. The additional cleaning in by‐pass filters should allow oil drain intervals to be extended or to operate engines without oil change and reduce engine wear noticeably, as claimed by some by‐pass filter manufacturers.To establish whether the claim is mere conjecture or if the addition of by‐pass filters into the oil circuits of passenger car gasoline engines are indeed of real benefit with respect to engine and lubricant performance, a research project was initiated by the UBA on behalf of the German environment ministry.Special attention had to be paid to the influence on oil contamination, variation in viscosity, detergency, dispersancy, fuel and oil consumption, engine wear and overall reliability and durability. Some highlights of the total programme are presented in this paper.
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