what is problem with later Discovery engines?

I have just been looking on another site although I have heard of the problem before and that is later Discoverys fitted with Ford engines that explode without reason.. one guy had it happen and he said the body needed to be lifted to remove the engine, another comment was that the Discovery engine was an uprated car engine that could not cope with the extra power although someone said it could be caused by driver misuse.. I was surprised when it was said there is no dipstick! I have no intention of buying a Discovery buy am very interested in what goes on with vehicles