Right guys....iv done all the servicing bar oil and oil filter (sometimes skint tells you to wait) and now that im going to do it im a bit confused as to which is the better oil....Castrol magnatec or Castrol Edge. Edge claims a stronger film strength and a few other things....While Magnatec claims its magnetic particle stick to engine when cold malarky. So which is the best for a k11 micra would you say?. I know mobil one is probably better than both but id expect that to be considerably dearer. Just want your opinions. Thanks. Also both oils claim state 6 months per change. That sounds a bit tight I always changed once per year with my other cars?