Hey! I had two Octavias with the 1.6 TDI: the mk2 (I sold it) and the mk3 (the current one). Personally, I prefer Castrol Edge 5W-30. On the mk2 I once used Ravenol and the engine was a bit noisier compared to when I used Castrol.
SOOOO I've always used full synthetic way before most vehicles started recommending it from the manufacturer. I've ran mobile 1, royal purple, and a few others. When we got our 2007 Mazda 3 all of the records/receipts showed conventional Castrol was used. I've stuck with it to see how it do... I've increased the weight "one step" because we live in a hotter than average climate but we just hit 290k miles with not major issues... my average MPG is 31.x and I typically do 10 over the speed limit (so it could definitely be improved).I change it myself every 5k miles. I think the frequency is more important than the quality with oil. I'd rather have super tech every 3k than mobile 1 every 10k. I think if you stick with any major brand, use a good filter, and change it regularly you'll be fine.
AP1 164k miles using Castro edge high mileage 10w-30. In my experience it does not burn as much oil as Mobil 1
I use Castrol edge because it's rated for high temp engines and BMWs run towards the hotter side.
I’m running Castrol GTX Classic 20w-50. The classic one has the extra zinc, I think they make another GTX that doesn’t.
In my experience it pays to use the right oil and brand is important. I always use Castrol EDGE, but i am in a hot climate and i load up my engine.
I live in India and in my place temperature ranges between 5 degree C to 45 degree C and sometimes it touches 49-50 degree C, I put Castrol's synthetic engine oil in a 100CC motorcycle and response from engine felt a lot better, cold start in winters were less stressful and in summer rides, it never felt engine is losing its breath like it used to feel earlier.
I use something similar Castrol Edge 0w-30 European Formula on my 2014.
Australia here - they used 10w-30
Feedback from showroom
The 10w-30 is the best oil due to the Australian conditions
Castrol oil MAG
Mine eats Castrol Syntec 5w40 like it's going out of style as well.
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