Evaluation of Camshaft and Lifter Wear, Deposits, and Oil Thickening with Low-Phosphorus Engine Oils in Taxicab Service

Abstract

<div class="htmlview paragraph">A 160 000-km taxi test was run to determine the effects of low-phosphorus engine oils on engine durability. Camshaft and lifter wear, deposits, and oil-thickening were evaluated in thirty vehicles with oil-change intervals purposely extended to increase test severity. Three SAE 5W-30, SF, low-phosphorus (≈0.06 mass percent) oils and two SAE 10W-30, SF/CC, normal-phosphorus (≈0.11 mass percent) oils were evaluated.</div> <div class="htmlview paragraph">Overall engine durability and performance was satisfactory with two of the three low-phosphorus, and one of the normal-phosphorus oils, and unsatisfactory (because of high wear) with the other oils.</div> <div class="htmlview paragraph">These results demonstrate that low-phosphorus oils can be provided if further phosphorus reduction is necessary to protect emission control systems, and that current normal-phosphorus oils must be properly formulated to protect engines.</div>

Related Papers

• → Real-Time Measurement of Camshaft Wear in an Automotive Engine - a Radiometric Method(1990)11 cited
• → Increasing the capacity of camshafts in automobile engines by plastic strain hardening of the surface(1979)
• Size recovery for cast iron camshaft of car engine(2015)
• Application on Sensors in Automotive Engine(2007)
• Gear ratting noise reduction of diesel engine; Diesel engine no gear hauchi soon teigen(1997)