A note about knee jerks. Don't ask a manufacturer if it's safe to fly in ash.They can usually only cite certified margins and I'm not aware of a declared certification of amounts, consitentcy, time and operating condition in any regulation.
The manufacturers however do have a more complete understanding of how to avoid and or mitigate operation should you find yourself in ash. The idea is to provide for safe flight and landing and not necessarily to address all wear and tear.
Read and understand your FCOM before attempting flight in unknown ash conditions
Do depend on the accomplishment of world wide ash tracking.against probable densities and altitudes and avoid the same as weather.
From and engine standpoint highpower (turbine temp) is bad when known in a cloud with symptoms