While we empathize with you, it's easy to view that you are tending to ostracize all other Palazzo owners with your titling of your issue as somehow a 'model' deficiency or inherit problem, not one that is yours only, or even located only within the engine compartment, which is a product NOT built or manufactured by the brand. It's one that is built for almost EVERY diesel motorhome in the marketplace.
We would be much happier to help out if the cause was one of a humble 'incident' with your engine, and not one of pointing out and labeling as if 'all' Palazzos were somehow 'lemons'. You may not have intended it to sound that way, but that's why 'heading' proclamations can be misleading.
If you stated in your body that maybe you just 'got a lemon', I believe it would come across much better. You also purchased a USED vehicle... that's not what you headline would lead most to believe, at least at first glance, which is dangerous.
I also imagine that your problems are not a deep as you might think, right now, while you are aggravated. Many coaches have eventual engine related issues, though most are not dangerous, expensive, or hard to overcome. They are computer driven systems that sometimes, like a laptop, or your iphone, just need a 'reboot', or a similar simple reset.
Ours has had a few trip-ups over the years, but while aggravating and even unnerving at the time, while traveling, none rose to any major issue. A 'engine' alert light on the dash, though, doesn't make one feel comfortable to keep driving, even though sometimes it's really just an emissions related 'fault', and not one of a big concern. Take care of it at the next servicing, etc.
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RVs of all sorts tend to be 'status' symbols for those proud owners, and in this community, as in many aspects of life, those owners don't want to be around those who only serve to 'bash' or 'proclaim errors' on their beloved coaches.
May you travel safely, and have the times of your life : )
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