Castrol Edge 0W40 A3/B4 vs Shell Helix Ultra 5W40

[LordNilesStandish]

Well for one thing there is no way you could make a meaningful fuel economy measurement that discriminates between two different oils, and then attribute your observation to that specific variable. There are many, many variables in every day driving and the effect of the oil is in the noise.

And why should Edge be “noticeably better?

Your question indirectly posses the question of consumer or customer subjectivity.
As if not all, most consumers, lacking the means or access to scientific data and testing, will base their assessment of product performance on subjective evaluations.
Eg does it look/taste/smell good etc.
True, my, and my father's evaluations are subjective with the only exception being the vehicles fuel consumption calculations.
Does a oil company marketing a premium consumer oil product take into account consumer subjective assessments of performance? Probably.

 

[V70tdi]

Even though it replaced very good oil with low mileage, it is noticeably smoother and has better MPG. 16 to 12 L/100 km spirited driving.

I have also introduced my elderly parents to Edge 5W30 in their 2013 Mazda SP25 and they are reporting smother operation and 20% improved mileage.

We have always used high quality oils however we are very pleased with Castrol Edge.

20% improved milage is a lot and every car makers dream. Sounds totally impossible to get that result with a different oil brand.

 

[Strumpan_]

20% better mileage due to a oil? if that was true every car maker would already use it to get their average fleet consumption down(if it is called that)

 

[Jerrysends]

Actually, Helix runs super smooth. In the US, it is sold as Pennzoil Platinum Euro 5W40.

How different is QS Euro 5W40?

 

[LordNilesStandish]

20% better mileage due to a oil? if that was true every car maker would already use it to get their average fleet consumption down(if it is called that)

He says it tapered off after a few weeks but is still better. I don't think he's getting 20% now but haven't spoken to him about it much. He also went from 10W40 to 5W30.
Who knows, maybe it freed up a sticking VCT?
It does sound noticeably smooth. It's working well for him.
YMMV.

 

[LordNilesStandish]

I have one more change of the Castrol Edge 0W40 but then I think I will try the Shell Helix Ultra 5W40 and see how I like it.