Porsche 911 1997 — technical service bulletin
Bulletin 122-M2T3L-09 · NHTSA communication 10148790 · issued Aug 14, 2018
Technical service bulletin
communication type
Engine and Engine Cooling
component
1997
model years
2
vehicle entries
Official summary
Subject: Cleaning cooling system. Information: Engine oil in cooling system (coolant warning light comes on).
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.