Engine oil Castrol or ZIC

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.

I use castrol 5w40euro but I’ve also used liquimoly 5w40 and it was also very good to me. Those are my go to’s but I’m sure many others have rec’d other good brands of 5w40 in comments.

Castrol Edge 5w-40 in my 2.8 2001 Passat, 3.6 2017 Touareg, 3.0T 2014 Audi A6 and Castrol Edge 0W-40 in my 2.5 2012 Jetta. Located in Minnesota. Usually run 5W-40 year round.

Jetta was picky last winter, so switched over to 0W-40 from 5W-40. Depends on how harsh the winter, might be a good idea to go 0W-40.

Castrol 5W-40 Eurocar. I live in the northeast and park outside. Car has been solid and I've used this oil since I bought it. 65k miles later, I see no reason to make a change now.

Previous comments about mobil 1 are right it’s best for reliability - castrol are seen as high performance oils

5W-30 Castrol Edge. FPRS uses it and has had very few failures on stock motor cars. I was also running it in my GR86, and Blackstone came back perfect on that car.

Castrol in my daily driver. The daily would have a slight ticking when warming up with other brands, not with Castrol, so I been using it for over 100k with no issues.

I'm running Castrol EDGE 0W-40 A3/B4 right now, but feel there is more startup noise than when using Mobil 1 FS 0W-40 European Formula.

Stay away from the stuff that the dealer puts in, the Euro Car formula(5w-30 i believe) that Castrol makes is a Blend, meaning not fully synthetic and it shears and burns really quick.