Engine Oils For GU Patrol 4.2ltr Diesel Wagon 1999

HI Ross,
Do you mind if I ask a complementary question as you seem to be knowledgeable in this area.
I have just bought a model with the same engine but mine is a 2005 4.2 turbo diesel Patrol.
The previous owner said he always used Delo 400 oil.... is that a good oil to keep using or is there a better oil for the Patrol 4.2?
Thanks
Cheers

G'day Wamuranman,
The Caltex Delo 400 is quite ok for your type of engine and is well recognized as doing a good job world wide.

I know Micheal uses the Valvoline Super. It seems to be ok but some people regard Valvoline the same as the Cheap offerings of BP oil.

Either the Delo 400 or the the Mobil Delvac MX would be my choice.

What everyone should be aiming at is an oil which seals rings better than others, this gives more power, more economy if lucky, and then there is less blowby because of the better ring/piston/cylinder wall sliding seal.
This is a dynamic thing and some oils do it far better than others despite the claims on the packaging.
There are some local trendy oils around and aren't much cheaper if at all and they appear to be involved with a few problems in the oil usage and sealing performance area.

If you have better sealing, the internals of the engine is polluted at a slower rate, the oil remains cleaner for longer and the better oil should then be costing you less as the service interval can be maximised with no loss of engine protection.
Generally cheaper oils don't perform as well and although cheaper, they have to be changed more often because of the contamination level. Changing more to provide a suitable level of engine protection means they will cost more.
In my HJ61 landcruiser the oil was changed at 8,000 to 10,000km depending on the usage.
A local transport company uses Mobil full synthetic in their B doubles and oil changes at 20,000km. Selected for that purpose. Over kill for your engine however.

Regards

Ross M

Thanks Ross for the good info, appreciated.
Cheers