I use the 5W-40 in my e46.
Castrol semi synthetic Actevo for my F800st.
I've always been a Castrol man for my BMW car.
Castrol Power 1 ultimate is great and cheaper too.
but real talk: Castrol GTX Synthetic 10w40 in Tennessee summers and 5w40 in winter.
5W30 Castrol edge full synthetic
Castrol Syntec 5W-30, because of this: [https://my350z.com/forum/engine-and-drivetrain/258663-vq-oil-analysis-and-info.html](https://my350z.com/forum/engine-and-drivetrain/258663-vq-oil-analysis-and-info.html)
Between it and the Castrol Syntec 0W-30 it has less wear indicators in the oil than any other brand, at any other weight.
Redline and motul are the best but I’ve been running catrol for 50k+.
As far as the castrol goes I bought a used 2018 Kia soul that had a slight knock in the engine for ultra cheap and I was able to make that sound go completely away once I switched to Castrol edge. My vehicle also seamed to burn a lot less oil.
I'm using Castrol GTX 20W50 because it's the only 20W50 that I can easily find locally. I tried Rotella 15W40 but I found that it gave somewhat low oil pressure on my old engine.
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