CDTI - low operating temperature?

[Arctic]

So what was the difference in the wax composition that makes the V1 V2 and V3 different?

I'm curious as I have a leaking upper coolant rail to attend to on the old man's car, and if I'm replacing the o ring on the 'stat housing, I'd like to fit a thermostat that was unlikely to fail in the same way as all of the others I've seen.

Brian

[/QUOTE]

Hi Brian.
Would the upper coolant rail be one of these below.
https://rimmerbros.com/Item--i-STC4646A

https://rimmerbros.com/Item--i-PEP000130

Either are a nightmare to remove and fit

I think the V3 was commissioned by DMGRS same outer casing i presume i could be wrong but different thermostat or wax part? again whom knows.

I agree only time i would remove the original stat would be if it were leaking, or the water pump needed changing, other wise inline stat every time.