The IP is on the side of the engine anyway to get heated for the diesel to flow freely, same with oil, this doesn't change the temperature of the IP.
There are few tale of pump failiure, I am not an expert on this, I just posted this PDF as this is really good info ( for me anyway) and liked other to have it as well. Kitchen style indeed but this is still style
About the chamber and the valves, some have been reported to have 300.000 Kilometer on their mercedes and still going strong on SVO, this when the oil was cheap, about WVO, not sure.
Olivier