BMW X5 2019–2020 — technical service bulletin
Bulletin B170120 · NHTSA communication 10176365 · issued May 1, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2020
model years
5
vehicle entries
Official summary
SERVICE ACTION - ADD SILICONE BOOSTER TO LOW TEMP COOLING SYSTEM: The coolant in the low temperature cooling system may not have sufficient coolant corrosion protection.
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.