Well put there Mr.Slick.
But still an old engine will use more oil when warming up, is this not true?
After disconnecting the breather on an old polo i think this must be true, the volume of blow by was much greater when the engine was cold.
Even though oil is thicker when cold, surely this is when you will lose the oil?
Like i said already, this is why people use 10w40 instead of 5w40.
I think we are probably saying the same thing in a roundabout way.
On start up the engine (oil pump) will pressurise the system. This can force some oil past rings etc due to the higher tolerance gaps so aye, as you say the oil can force by and out through a breather.
Fortunately this is minimal as the metal components will heat up quicker than the fluid will, and thus close the tolerances down again.
