ummm no, you made the wrong decision, was their any oil consumption or smoke issues on 10W-40?
this is just a simple mineral oil, nothing fancy about it, infact ZIC has more advanced API rating than this, your car requires thin oils, you should have been looking near fully or semi synthetic oils not this, Ceratec is a good addictive but the oil choice is poor so you wont see magic, your fuel consumption would remain same or maybe even worse with this mineral oil.
liqui moly 10W-40 MOS 2 was all you needed for your car, it wont hurt it at this milage and has mos 2 addictive,
and dont use drain interval of 7000km with this 15W-40 oil please, its just a mineral oil and your 660cc with small oil capacity will cook it very quickly, you may use 7000km with semi synthetic oil at least.
but hey if you already bought it its okay, just change at 5000km, its not a bad oil, i used to use it in my big generator its just that you have been misguided by just the brand name and didn't look at the specs.