Nissan Slump problem

I HAVE noticed the questions about Nissan turbodiesel motors blowing up a few years ago, and specifically whether the problem had been addressed or not. A Nissan dealer told me that the problem came about with the resizing of the 2.5-litre motor up to three litres. Apparently the sump and the oil pump weren't altered to allow for the increase in power and capacity and subsequently the motor was starved of oil and blew up. Nissan worked out the problem by the GU3 motor and altered the sump and pump accordingly. A lot of people have apparently retro-fitted larger sumps and pumps themselves to address the problem. Not sure if it's true, but based on the history of the early 3-litre engines it makes sense.