I ran quite a few 4L bottles of the 5w30 full synth CT stuff in my car. While I have no oil analyses I can tell you how it performs on a 2.0 Zetec 4-banger. It starts out thick, then shears down to a 20. I know this because the engine gets easier to rev as the km's march on. I don't see this as a disadvantage. It consumes oil. Less comes out than what was poured in. Maybe as much as a litre. Hard to measure this accurately however. What comes out looks quite dark. The GC is better for highway driving by far than this oil, but this oil is better for city driving than GC.