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Subaru Super Coolant #5116524 05/26/19 05:10 PM
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FA_WRX Offline OP
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Does Subaru suggest using their coolant conditioner when changing coolant in later model cars? I've read that might have been only for mid 2000 model years.

Last edited by FA_WRX; 05/26/19 05:11 PM.

2015 WRX FA20F
Valvoline MST 5W40
Tokyo Roki 15208AA170 filter

Re: Subaru Super Coolant [Re: FA_WRX] #5116607 05/26/19 06:42 PM
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Padawan Offline
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Yes, the 2015 WRX service manual states:

2. FILLING OF ENGINE COOLANT

1) Pour cooling system conditioner through the filler neck of coolant filler tank.
Cooling system protective agent:
Refer to “SPECIFICATION” for cooling system protective agent. <Ref. to CO(STI)-2, SPECIFICATION, General Description.>

2) Fill the engine coolant into coolant filler tank up to the filler neck position.

The "cooling system protective agent" is listed as P/N SOA345001 in the manual.

Re: Subaru Super Coolant [Re: Padawan] #5116788 05/26/19 09:25 PM
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gathermewool Offline
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Originally Posted by Padawan
Yes, the 2015 WRX service manual states:

2. FILLING OF ENGINE COOLANT

1) Pour cooling system conditioner through the filler neck of coolant filler tank.
Cooling system protective agent:
Refer to “SPECIFICATION” for cooling system protective agent. <Ref. to CO(STI)-2, SPECIFICATION, General Description.>

2) Fill the engine coolant into coolant filler tank up to the filler neck position.

The "cooling system protective agent" is listed as P/N SOA345001 in the manual.


I wonder why its not listed in the owner's manual. Changing the coolant must be beyond what they figure the average owner is capable of...


14 Forester XT Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (72,320mi, 8/24/19)
15 Legacy Premium FB25
Magnatec 5W-20 + FU filter (47,300mi, 5/11/19)
Re: Subaru Super Coolant [Re: FA_WRX] #5116889 05/27/19 12:11 AM
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Padawan Offline
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It used to be stated on earlier models, but for some reason they changed the manual to imply that it's not owner servicable.

Re: Subaru Super Coolant [Re: FA_WRX] #5116918 05/27/19 02:15 AM
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FA_WRX Offline OP
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Yes. You would think they could list it in the fluids/capacity section. Or maybe the thinking is with a suggested 137k service interval its not a service done a lot.


2015 WRX FA20F
Valvoline MST 5W40
Tokyo Roki 15208AA170 filter

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