Hi Plas, just my 2 cents worth,

I use the Delo 400 as it best suit the climate as I am up in the Pilbara in WA with regular high temps and want to avoid any sooting of the oil.
Previous oils were based on general consensus from other 3.0lt Patrol users but most blokes up here swear by it hence the change.

Ages ago I blocked the EGR valve and I have since noticed that I do not have the build up in the intake butterfly valve that used to be there.
My engine is not noisey at start up and the turbo sounds sweet for a 2000 model GU.

As a maint Fitter I am very particular with my servicing and generally dont do things by halves.
5000ks are my service intervals and at around $100 for oil it is cheap insurance.
cheers