Cooling System - Information on Coolant Refilling

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) Technical Service Bulletin # 170106 Date: 110401

Cooling System - Information on Coolant Refilling

SI B17 01 06

Cooling System

April 2011

Technical Service

This Service Information bulletin supersedes SI B17 01 06 dated September 2007.

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 199

[NEW] designates changes to this revision

SUBJECT

Refilling Coolant Systems

MODEL

All

SITUATION

BMW recommends filling the cooling system for protection against freezing down to -34锟斤拷F (-37锟斤拷C). This means an antifreeze ratio of 50%

antifreeze and 50% water. In severely cold areas, the antifreeze can be increased to 60%, which provides freezing protection down to -62锟斤拷F (-52锟斤拷C).

Do not exceed a 60% ratio of antifreeze. The specified antifreeze ratio is important, since an insufficient amount would impair anti-freezing and

corrosion, inhibiting protection. An excessive amount would not improve freezing protection, but would instead reduce freezing protection. At all

times, the antifreeze and water should be pre-mixed before pouring into the engine. If pre-mixing is not performed, damage will occur to the water

pump assembly.

Since model year 2004 (and Z4 MY 2003), BMW has been using an engine coolant with a long-term life rating. The long-term antifreeze/coolant

must be completely drained and replaced only in conjunction with any Repairs that require replacement of aluminum or metal cooling system

components. The corrosion protection for these components is provided only in a new long-term coolant. On all other repairs that involve draining of

partial quantities of coolant, replace the drained quantities with new long-term antifreeze/coolant.

[NEW] Refer to SI B17 01 07 and B17 01 10 for additional information regarding BMW long-term antifreeze/coolant, maintenance, repairs,

replacement requirements and replacement procedures.