Quote:
Originally Posted by groar
I plan to visit my mechanic when he is back from holidays to know more about it and see the difference between his 10w and 5w oils. He insisted on the fact the 5w is more expensive and it was 20% more expensive. It may be some magic with some additives in this oil, or some magic from new kind of filter, or...
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I saw the mechanic Yesterday and we talked about it. He didn't made anything else than what was mentioned : changed air & oil filters and oil. The 10W40 oil is a semi-synthetic one, while the 5W40 is fully synthetic.
He had no idea about what could have such an impact on fuel efficiency in idle. He was only afraid of the engine eating too much oil as they are using 10W on all engines except the newer with particles filters on which they use this 5W.
Yesterday the same mechanic did the maintenance of the megane, he changed air, diesel & oil filters and oil from 10W40 to 5W40. I'll see if this is confirmed with my wife's next tank in scenic and my next tank in megane I filled up today.
Denis.
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