Don't panic my friend!
We "self select" in terms of reporting "failures" on this enthusiasts' forum... while extremely helpful in understanding what "might" go wrong, there's also a need to put such reports into context in terms of a statistical probability. I'd venture to say that by my "back of the envelope" estimate the vehicle is far more reliable than many other marques.... (a million V8 engines in the recent GM recall, Honda and Hyundai likewise with the curse of manufacturing debris left in engine blocks)...
(Yes, my HP coolant reservoir also developed a crack...it's a BMW issue across many models).... but I'm relaxed about the Grenadier's overall reliability