Quote Originally Posted by aaronng View Post
That is odd, wonder why. To burn, it has to get into the combustion chamber. When inside the combustion chamber, all oils will burn as the combustion temperature is above the oil's ignition point.
Different quality and quantity in PAO/Easter proportion can affect seals differently, shrink, swelling. That will affect the amount of oil getting to areas that they shouldn't. No further info in Motul and Agip oils to follow up as to what's different from Shell oil.

Quote Originally Posted by chargeR View Post
I am still interested in why you want a lower viscosity (eg 0W or 5W) at low temperatures?
0W is often mentioned because of the amount of PAO/Easter needed to use as base stock to achieve this viscosity. 0W40 will have a good proportion of PAO to handle track conditions while a reasonable number of HTHS to protection the bearings. If a track car using 0W20 on track, I will be saying they are after ultimate horsepower while don't mind rebuilding every second session. Having said that, there are small can additives they might use for extra protection according to their applications.