Chevrolet Aveo 2004–2008 — technical service bulletin
Bulletin 4294 · NHTSA communication 10023757 · issued Dec 1, 2007
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2008
model years
5
vehicle entries
Official summary
Crankcase contamination due to coolant in the engine oil - reseal casting plug. With built before vin breakpoint 8b067818 (july 24, 2007) & 1.6l engine (vin 6 - rpo l91 or lxt). *nj
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.