Hi all, Golf R 2015 owner. Currently some 80 000 km on the clock. Living in the land of unlimited autobahn, I often find myself driving long distances at high speed (say over 200 km at speeds around 220 km/h), and "canyon carving" on the weekends. The car has had the regular VW service till 70 000 km, i.e. oil changes every approx 15 000 km (the computer default is 20k km and decreases with my driving style). I changed the oil myself this weekend for Castrol EDGE FST Titanium 5w30, VW 504 approved. As such, I have noted two things: - the engine oil heats up much quicker. Before, it would barely heat up on my city commute of approx. 15 Km (shutting down the car, it may show around 90 C). Now, at about half way, I see fully heated oil temps of around 100 C. - the car seems to rev much easier Checking previous invoices, it looks like Castrol SLX LL03 was used, which, from google, seems to be 5W30. However, given the above, I wonder if the previous oil change was a 5w40 fill? I assume a 5W40 would explain both the prolonged time to heat up, as well as larger internal resistances = does not rev as easily. Given that the warantee will expire soon, I plan to take matters into my own hands, and do oil changes every say 10 000 Km. Given that the car is driven hard, should I run 5W30 or 5W40? And specifically, what brand/type? If possible, I would like an oil that is readily available in Europe, i.e. Castrol, Mobil, Millers, Motul, Ravenol, Valvoline... etc. Thank you.