This is an excellent report and an impressive lube. well add it to my have to have list then! In the 60's we used 30wt in the summer and 20wt in the winter for most all cars in the midwest.I for one was one of the last to change over to multiweight oil.We have come a long way with oil since then and is it more about the oil or the engine design that keeps us all from running a IMPRESSIVE LUBE like HAVOLINE 5/20 in our car today.The biggest question is will it hold up as well as the 5/30 or 10/30. I for one would feel better if a oil sheers down to a 20 wt. from 30 as opposed to a 5/20 going to a 10wt..So is this robust add. package enough to protect the engine under grueling,sever conditions for only 3000 miles to use in the SE-R & WRX engines that call for high viscosity.If 5/20 can be run by Ford safely then why not all gasoline engines.