Hello Mazda driver! My father-in-law drives a Mazda 6 1.8 petrol year 2006! He now has problems with the oil consumption! Since April 2012 he has now had to fill at just under 1000 km holds 2 liters after! The free workshop has filled him with engine oil with SAE 5W40 at the last change in September 2011! This oil is not in the recommendation in the manual! There I find 5W30 or 10W40! Since the next change is due, I would like to have your opinion and recommendation about the engine oil! Thank you!