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If the thermostat is stuck open it will not heat up indeed it will actually warm up a little if stationary but it will cool down rapidly once moving...open thermostat will never cause overheating,...

Well, if it was done properly they'd use vacuum refilling unit where the created vacuum in the cooling system would sucks in correct amount of coolant from a container and without air pockets....
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So indeed, you mentioned the cooling system was worked on recently? I know for the fact that ZD30 cooling system is very difficult to purge of the air unless done correctly. However that shows up...

Firstly, how do you know it is hitting 122°C, factory gauge will not point to that. So Scangauge perhaps? Is it just incorrect gauge setting because at that temp the engine will be cooked for sure.
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Well, the rating you see on the bottle is not indicative of thinner oil per see just it is able to flow at certain temperature.

If you really want to compare the oils ignore the '5W-40' rating to...

ZD30 needs semi synthetic 10W-40 oil, or that's what Nissan seems to be very particular about when recommending the oil for Y61 with ZD30.

You can extend the drain interval with synthetic oil but...

The metal tip glow plugs don't last longer then ceramic ones, indeed their lifespan is significantly shorter (20K vs 100K) especially in the way used in ZD30.

The timer needs power reset to use...

Mine is Di so I'm not sure what size is the rocker cover fitting on CrD but you can buy the whole shebang complete with hoses to suit your Patrol from Western filters, no need for reducers as hoses...

Well, my experience is based on sand and on dirt roads. I actually avoid going in 4WD mode on normal dirt roads as the understeer combined with tight rear LSD can make the car twitch and unstable in...

I've got one in mine and although its only 118kW engine I'm yet to break it LOL.

There are things to consider though:

Cons:
Really heavy steering once in 4WD mode,
Extreme understeer in the...

Well it could be but in any case to get to A/C (Air Conditioning condenser) it is easier to remove radiator because you do need to back wash it. You'll be surprised how much stuff get trapped in the...

No need to lift the car up mate, however if yours is ZD30 powered then the OEM dump pipe/DOC (Diesel Oxidation Catalyst) will not come off unless you drop LH side of the sway bar (front).

Regards

70468

http://www.nissanpatrol.com.au/forums/showthread.php?4202-Nissan-Patrol-GU-Y61-service-manual-INC-Supplement-I-II-III-IV-V-VI-VII-amp-VIII

and/or
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The counter question is why are you asking?

Most DIY persons will happily overfill especially in ZD30 scenario because the oil drain times and because Nissan had stuffed up the whole thing.

So...

What info are you looking for? Is it how to rebuilt the pump? That is not there, and good luck as Zexel/VP44 clones are not DIY projects.

I find it hard to believe that there is no Bosch diesel...