It's not "absurdly confusing" - there are only 5 ACEA-C- grades which cover all modern car engines - indeed most use ACEA-C3 - for older cars, there's only 4 ACEA-A/B- grades - how simple can it be?
Simple for you and I, but the average punter has no idea what ACEA and their grades mean.
Just putting in our bog standard Focus reg number into Halfords reveals four different oils to choose from. And on some websites, the reg number doesn't work. Try putting X84NJB into eurocarparts for oil and it says 'no products found'! As for the multitude of colourful plastic products on the shelves.....
If it were that simple there wouldn't be so many requests for oil advice on sites like this.
We don't need to know what ACEA grades or SAE viscosity means - if the car handbook specifies SAE 5W-30 ACEA-C3 then it's simply - just look at the oil container which gives it's SAE viscosity and ACEA grade.
There is no concept of "better than" so C4 can't be used in place of C3 - some oils meet multiple standards and will state that, eg ACEA-C2,C3
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