DefenderPilot, thank You for the tips, will do all that!
Discodevon, thank You for that info. I would love to use something that the engine loves

Is that 10w part a problem in the winters? We have a couple of weeks of -25*C each year. Is that something that this oil could handle? I would gladly start using something new, because the oil is always dirty, even though the engine seems ok (injectors on nanocom, general smoothness and power) and the EGR has been deleted some 15k km ago..