[landrovered]

I think it is a case of "if the poison doesn't kill you the cancer will".

Wear occurs before the motor is warmed up at startup. We agree on that.

Cold oil is more viscous, I think we can agree on that.

The question is:

Which is worse for your engine, insufficient lubrication due to increased viscocity of cold oil, or the effects of inefficient combustion on your oil and catalytic convertor.

The lack of cars on the side of the road is not sufficient for me to change my views on this. The lack of evidence is not evidence to the contrary.

I have two cars that I have owned since new with over 200k miles on them on original engines.