GM Service Manual Online
For 1990-2009 cars only
    â€¢ Improper oil viscosity. Install recommended oil viscosity for expected temperatures.
    â€¢ Excessive piston to bore clearance.
    â€¢ Excessive piston pin to piston clearance.
    â€¢ Excessive crankshaft end clearance.
    â€¢ Excessive crankshaft bearing clearance.