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TECHNICAL BULLETINMarch 2002TB 1963
Mfg: Lexus/Toyota Model: Car/TruckLiter: 3.0LCode: V-6Year: 1993-2001
OIL CONSUMPTION OR ENGINE DAMAGE ON1993-2001 Lexus/Toyota 3.0 V-6 Engines
The AERA Technical Committee offers the following informationregarding oil consumption or engine damage on 1993-2001 Lexus/Toyota3.0L V-6 engines. Either of these conditions has been reported eventhough proper oil maintenance has been endured. The cause of theseconditions may be the result of oil pooling in either cylinder head.If the oil is allowed to puddle several undesirable scenarios mayresult.
Depending upon the startup oil level in the oil pan and the amount ofpooled oil while the engine is running, a depleted amount of supplyoil may remain in the oil pan. The amount of oil in suspension in thecylinder heads may overwhelm both the valve stem seals and PCV system,causing oil consumption. This oil consumption may or may not produceoil smoke out the tail pipe as temperatures within the exhaust system(catalytic convertor) completely burn the oil vapors.
The apparent cause of these conditions is oil sludge accumulation inthe cylinder head drain back passages preventing sufficient oil flowfrom the top of the engine to the oil pan. It has also been reportedadding a quart of oil to an engine showing a quart low level on thedipstick may be misleading. In some cases with excessively sludged upengines, the amount registering on the dipstick does not equal theamount added to the top of the engine.
Some AERA members report repeated engine oil flushes and changes maybe a temporary resolve for effected engines. Also, much shorter oilchange intervals are necessary, perhaps as often as every 1000 milesto keep the sludge from reappearing.
The AERA Technical Committee
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