Engine Valve Guide Wear on Porsche 911 Turbo

Engine issues related to valve guide wear are common. Oil consumption, smoking at first startup, and valve train noise are all symptomatic of loose guides and worn valve stems. The valve train is complex and should be thoroughly inspected if a problem arises. Worn turbocharger bearings can also be a component in engine oil consumption.

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Average mileage: (–)
6 model years affected: 1991, 1992, 1993, 1994, more1996, 1997
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