Hi Simon, welcome aboard.
I'm sure you're already aware that the MX6 has HLA's to take into consideration. They often rattle so the correct oil is always an issue for us.
The oil of choice seems to be Mobil1 0W40 - but that's pricey...
Halfords synthetic 5W40 seems to be a popular choice because it's often on special at £20 for 5L.
Finally, what's your opinion on some of these "anti HLA noise" additives? Are they worth using?
Cheers,
Ken