If 95% of engine wear takes place at start up, particularly with a Ducati 4 valve that has to wait up to 90 seconds to get the oil to the rocker assembly wouldn’t it be prudent to use an oil with a lower viscosity to ensure that the thinner oil gets there as quick as possible?
Is there really that much difference between a 10/40 fully synthetic and a 15-20/50?
Especially when you look at the stats below:
http://www.shell.com/home/Framework?...t_ga_2101.html