Note the timing gears from the 2.5 Boxster M96 engine. 0-40 M1 with excessive oil change interval. It was specified by the factory. Government regs have a great deal to do with current oil specs. Any of the products you have listed for consideration will be OK BUT chose an interval that suits the one you choose. Error on the side of caution. Any of the synthetic products listed are overkill,especially if the change interval is shortened. I treat my toys better than I have to,so no lecture here about spending more than you have to. DO WHAT YOU LIKE. You must have some opinion about what you do and dont want.