The 70 doesn't have an oil pressure gauge but when I do the same journey in the advance, the oil pressure drops to 1 bar on idle hot in traffic, never goes lower than that. If you're worried about it, maybe you could lift the idle to raise the oil pressure a bit? I changed the ECU temp sensor, the fan and gauge work fine so I've not touched those. I had my hopes up that it was the ECU temp sensor at fault, because when I removed the old sensor the plug was wobbly. But it still does it. Another strange thing happened for the first time last night- the throttle seemed to be stuck open when cruising in 5th, I lifted off and it carried on pulling on. Now I have a spare TPS I'm going to try changing that, and maybe even the throttle body itself. I've sprayed it with GT85 etc. and its free and not sticking but maybe the TPS is in need of setting up with feeler gauges?