I’d say 170k / 5 = 34 * 25 = $850. Throw in air filters, and a couple transmission fluid changes, and it would certainly be under $2k.

That’s assuming DIY, but even if you’re paying $80 per change. If you do them every 7,500… you’re still $1,800 total.

$12k is plenty for a whole new engine, possibly a new engine and transmission on an economy car. For example, Ford will happily sell you a brand new 2.3 Ecoboost for a Mustang or Ranger or Explorer for $6k: https://www.trackey.ford.com/part/M-6007-23TA