(This is kind of a spin-off of a post I made in a Euro Castrol thread, but I thought I'd post again and see what you all thought...) Everyone on here keeps hootin' and hollering' about German Castrol 0w-30 and how good it is. I guess no one talks about the HDEO 15w-40's because their not the "new-fangeled" oils on the market, but if you take a look at these oils, I believe they are some of the best stuff on the market. Yes, I realize 15w-40 is not for all engines, but for those that can use it... Obviously, it won't flow at low temps like 0w-30 Castrol, but I can go over to Wally World and get a group II+ oil that is: Extended drain capable Shear stable Great additive package Will keep my engine "spotless" What do you all think? Are these oils (specifically Pennz. Long-Life, Delvac, and Delo) as good as I make them out to be or am I missing something? $6/gallon vs. $4/quart...tell me what you think.