You can turn an unreliable car into a reliable one by removing and replacing the unreliable parts with ones that aren't so, and if, over the course of time it doesn't fail, then it has proven itself reliable. I used to have a very unreliable car every time it rained, but once the leaky windshield was refitted and sealed correctly water no longer seeped into the
ecu and now 7 years on, it's never been an issue. Unreliable part found, replaced by reliable one, and thus, reliable car.
Same goes for Daz's beast. Unreliable parts have been repaired and replaced, 30,000km later it's still running as it was when fitted, so seems pretty reliable to me.