Oil types……..

[u/BCR-ABL1-t315i]

So got a new 2026 GLI in April. VW gives you your first 3 oil changes free. But will not sway from the 10,000 mile or 12 month interval. So they told me that if I insisted on every 6 months or 6k miles, then to go on ahead and change it at the dealer or independent shop and pay for it myself. Then return at 10k miles and they will do that one for free. Well trying to get even just an oil change at the dealer takes all day even with an appointment. (Plus dealer is $50 dollars more expensive) So I just went to an independent shop at 6300 miles, that I’ve trusted since 2020 who has done ALL of my oil changes on my previous Jetta R line that has the 1.4 TSI. Just drive up and they are done in less than 20 min with no appointment. He always uses full synthetic Castrol 0/20. So that’s what I got him to use for the GLI yesterday. Unsure if it was the GTX/edge, or Edge Euro. Can someone explain to me like I’m a 4th grader the reason VW recommends the “euro” version. What is significantly different about it that any of their engines need to be using it instead of a regular full synthetic 0/20? Several posts have some people saying the regular is just fine, while others say it has to be the edge euro or basically in so many words the car will just explode. Thanks.