German Castrol....
Well, as you might guess it engineered for German cars
German cars (specially BMW's) actually run a different type of slug (or piston) than most cars. It is a low friction slug, which helps reduce frictional loss in the engine which is always a battle. So essentially you get a better performance, better MPG and a more efficient engine overall.
So why don't Jap cars do this? Well, the bad part of the low resistance slug is that it has a larger piston ring gap, which means more engine oil blow by. How do you fix that? Use thicker oil, or oil that retains a lower viscosity at higher temps. Jap cars use a very close tolerance, so this type of thick oil is not needed. In fact thinner oil is preferred so that it can penetrate in to the tighter gaps and properly lube the engine.
Since Jap cars are not designed like this, most of them are economy green based engines, this oil doesn't fair to well in Jap cars. German's have had their own type of oils for years now, the previous M3 used some outrageous oil weight like 15w50 AND still burned oil for the first 15,000 miles. In short, this is not an oil for a Honda, it's for German cars, just as the name implies.
BWT, Jap cars are built with tighter specs than American cars. So for a car like the LS1 or even my Ford V8, it would be a bad oil. It's not my first vhoice, but it's not bad. But not in my Honda.
