Engine oil Castrol or VALVOLINE

I've been using the original castrol 10-60 oil and then more recently the BMW M TwinPower 10-60 oil for the last 10 years on my e46 M3.

I was running Castrol 0w30 European formula in my 07 323i and the car ticked a lot and made noises I’ve never heard it make previously when running 5w30. So recently I swapped to castrol 5w40 European formula and the car is whisper quite even on cold starts. It just sounds so much healthier.

I've been putting in Castrol Full Sythnetic 5W30 in my 2.8VR6 for 13 years and I've been told the engine is in great condition (264,000 km).

I run Castrol 5w40 in all my VWs. 2.0, 1,8T, and my mk7 2.0T all have used it and I've been happy with it.

I’ve been using Valvoline full synthetic with a KN filter. Never had an issue

Valvoline full synthetic with max life tech is my current favorite but I think I might be able to unseat him soon.

Personally I buy exactly the factory oil, from a manafacturer that factory put in, in German cars it's Castrol, French are Total and Elf, Italians use Petronas Selenia.

My r53 loves Castrol 5w40 and Mann/Mahle filters.

Castrol Edge, I have used it forever in both my vehicles and I 10/10 reccomend it.

I have run the 5w-40 and stuff every day here in utah and it works fine on 300-400 bhp setups. If you are going to the strip or the dyno and going for probably 450-500 crank I would probably grab that gold top mobil one 15w-50. I would also use that for any road racing where the engine oil gets really thinned out from heat. It's also cheap at wal mart I believe. Over at 575-600 bhp we lost a main bearing when doing endurance testing on valve springs with the 5w-40 and very reasonable oil temps. It didn't really catastrophically fail, but was on it's way to it when we tore it down. Have since switched to VR1 20w-50, and the problem so far appears to be cured. That stuff will carry way more load then the thinner oils- the catch is that it's absolute sludge until warmed up. Yet another one of the barriers to extreme power "street" cars I suppose. I'm keeping an eye on it to see if we have a solution. If that doesn't fix it, the problem may be aeration of the oil- we were running at 7500+ for pretty long periods. So basically now the oiling system is a major focus of R&D for us. The oil pressure was never out of the ordinary- although it does start falling once past about 7500 rpms which is also not great.