93k miles - replaced control arm bushings (cracked & worn)Out of curiosity, what did you have to repair/change (beyond usual wear & tear items?)
This was more for the old graphite coated head gaskets that used to fail regularly. Now they have it as part of the coolant already added.Speaking of additives Subaru has long recommended adding Subaru Cooling System Conditioner to the cooling system when changing coolant. Subaru began this recommendation two decades ago to address head gasket failures. I have changed the coolant several times on my high-mileage 2010 Forester and have always added the conditioner to the fresh Super Coolant, even when an independent Subaru-only shop recommended no doing so.
After 230k miles my 2010 Forester has never had a cooling system leak or other issue (such as clogged heater core) and it still has the original radiator and head gaskets. To this day it has no evidence of a head gasket leak either externally or internally. I last had an oil analysis done at 190k miles and Blackstone reported 0.0% antifreeze in the oil.
I don't know if Subaru still recommends adding the conditioner on the 2020/2021 Crosstreks but the following recommendation appears in the Warranty & Maintenance booklet for our 2019 Crosstrek: "To prevent cooling system leaks, always add Genuine SUBARU Cooling System Conditioner whenever the coolant is replaced".
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