Graeme do you know what the oil pressure switch setting is on the 4.4 TDV8?
I had read somewhere the TDV8 has a lower set point than the TDV6 (or was it higher?)
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I don't know the switch pressure setting.
Edit 2.2 to 5.9 psi, so not very helpful.
The TDV6's switch looks to be a long shank version of the 4.4's so could easily be functionally the same.
I have a 0.25bar (3.6psi) switch to compare with, and I can also get a 0.5bar (7.2psi) switch as well which uses the same electrical connector.
If it takes longer to go out because it has a higher set point I am happy with this knowing it will come on sooner as well.