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No point on the old 2.2. If the HG goes bad on that it will be a combustion chamber leak and no amount of coolant conditioner will stop that.

 

If you have the phase 2 with MLS gaskets it may be helpful, but even those are not prone to leaking.

Phase 2 2.5 is the one that needs the coolant conditioner because it seeps externally.

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like said, it's only intended for later Phase II EJ25 engines (00+ and some 99's) with a very specific failure that they all have in nearly the same spots - external headgasket breach.  it's unlikely to do anything for the EJ22 which doesn't leak unless it's been overheated/run hot.

 

but for $2 a bottle from Subaru, who cares either way, you don't have anything to loose as long as it's properly used.

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I am in the process of replacing all the hoses, but that is about four a year....

 

I didn't know it would help with hoses

 

For the price I might try it?  There are no leaks, yet...

If you are making all good/new hose connections, you might just save the $2-$4 w'ever and skip it.

 

here's more info about it; http://www.scoobyenthusiast.com/subaru-maintenance/all-about-subaru-cooling-system-conditioner-soa635071

Edited by 1 Lucky Texan
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