The first thing I'd do would be to install an engine watchdog device, so you know as soon as the coolant system is over temp.
Or get the BtSsm app or even Torque app, and set an alarm for same.
H6 are notorious for developing air pockets in the heater core, or from an improper bleed after maintenance, and the result is usually a blown head gasket, usually around the $3000 mark to fix.
Other preventative measures include changing the coolant on time, replacing the stock radiator every 100-150k km, dont mix coolant colours, changing out any bulging when hot hoses, back-flushing the heater core both ways (the in and out sides) and bleeding the cooling system maybe once or twice a year: cant hurt.
If your heater starts playing up, not heating, intermittent heating etc, waterfall sound behind dash (not to be confused with weird sound inside dash: hvac blend door actuator fault), take action immediately.
Other than that, plus timing chain guides, avcs and alvs issues, they're lovely cars, I cant wait to own one
- Screen Shot 2020-08-30 at 6.33.21 PM.jpg (93.92 KiB) Viewed 7006 times
Source:
https://www.alldrivesubaroo.com.au/serv ... t-repairs/ See H6 section.