You need to have a few thousand kilometers up before they begin to perform. Mine has gained from a few longer drives and was running much better after the round trip to Sydney. Despite propaganda to the contrary all engines require bedding-in, which is why it's a good idea to change oil early and get rid of metal from this initial wearing-in phase. My motorcycle had a scheduled first service and oil / filter change at 800km and I did another 3,000km later.
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Interesting they changed the oil and I must make sure they DON'T change the oil on my car the week after next. The 5W is the viscosity index at 40 degrees and the 30 or 40 is the viscosity index at 100 degrees (multigrade oils). My personal belief is that 30 weight is too thin for Australia and 40 weight is better (my air-cooled motorcycle is recommended to run 15W50 - where 50 is thicker at extreme high temperatures).
ACEA A1 is a standard for low friction / low viscosity (B1 is the equivalent for diesel engines).
ACEA A3 is a standard for extended drain intervals and this is a combination of the oil's ability to absorb combustion by-products as well as anti-shear (the breakdown of multigrade oil to single, thinner grade over time). Shear can reduce 5W30 to 5W5 which isn't good. (B3 is the equivalent for diesel engines).
ACEA A5 is a combination of A1 and A3 - that is low friction, low viscosity, extended drain. You will not and never will find a 40 weight oil in the A5 category. 40 weight is thicker, therefore it won't meet stringent low friction requirements.
Personally I think a 5W30 is going to turn into water at high operating temperatures, and a turbocharged engine is guaranteed to produce high operating temperatures in warm to hot weather. This is why I have filled my car with 0W40 ACEA A3 oil. So I have extended drain but not low friction. 5W30 is okay for the US, Europe and certainly for Korea, which has a long winter and a short but not hot summer.
My motorcycle as I mentioned above is air cooled and runs oil temperatures of around 100 degrees in warmer weather, and could run up to 120 degrees, and that's why a 50 weight oil is recommended. The reason for the 15W is that something like a 5W50 would need a lot of viscosity modifiers to reach 50 weight at 100 degrees, and an oil of this type would be prone to shearing (especially in a motorcycle where the engine oil lubricates the clutch and gearbox). So the motorcycle has a relatively thick oil when cold (15 weight) and it's down to me to treat it gently until the oil warms (about 10 minutes normal riding).
I would expect a Veloster turbo to run oil temperatures of 90 degrees or more on the open road in hotter weather.
Although Hyundai quoted Castrol Edge 0W30 as being ACEA A5 it doesn't fall within their recommended viscosity range (5W30 or 5W40). There is a risk of engine damage if this oil is used. So the range of A5 oils is quite small and it would be hard to buy most of those products.
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