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Old 02-17-2004, 10:47 PM   #8
Jon [in CT]
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Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
02 WRX Sedan


I see no mention of adding Genuine Subaru Cooling System Conditioner (P/N SOA635071) whenever the coolant is replaced.

See for a description of a Subaru Service Campaign to add this conditioner to certain early Phase II 2.5L engines (1999-2002). Although that Subaru Service Campaign only encompasses those vehicles mentioned above, Subaru has issued service manual and user manual updates for all recent vintage Subarus recommending the use of the conditioner to prevent leaks. For instance, an updated page for the 2004 Impreza may be viewed at
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