Originally Posted by Gustlock
I hope you are correct. Yes the thermostat Opens at 98C (208F) and is Fully Open at 107c (225) and the new coolants apparently manage higher boiling points. The issue is that at the higher fuel flows and under load the thermostat quickly runs out of control range and there is insufficient cooling airflow to control the cooling system. Obviously this is the way it is these days for better fuel economy and reducing exhaust emissions. Strange that other manufactures haven't quite gone to these extremes. Seriously though, do you think 120C(248F) is acceptable if everything is OK?
Well, you and I are obviously used to engines running much cooler.
Having said that, I have seen close to 120C on my old Nissan Patrol, and it was still not quite boiling though how close I don't know, it has a lower pressure cooling system, must have been close!
Yes, the synthetic oils will handle such temperatures and more no problem whatsoever.
Will everything else? I hope so!
And although many people complain about the gauge being so active, not damped down and absolutely lying about engine temps like so many other makes, (like my mates Toyota Landcruiser or my wife's i30), I have yet to hear of even a single JGC diesel actually overheating
(My mate always used to brag about his LC having "a proper cooling system", and that the gauge never moved. So one day after climbing a range with the van on the back, I stuck a non contact IR thermometer on the engine cooling system outlet- boy did he get a shock! He hasn't said anything since!