I’ve always used castrol edge on my old cars, and the oil comes out cleaner every time I do an oil change. That’s been my experience
High mileage oils like Castrol edge have more detergents than other oils, not a marketing gimmick.
Change my e90 n52 every 15k, castrol titanium 10w-40. blackstone reports confirm the oil still meets spec with plenty of detergents left. Showing no signs of wear at 170k.
The 5W30 full synthetic engine oil works the best for a wide spectrum. Its working temperature range is practical for daily use and it costs less than 5W40.
I just run castrol edge on mine. No issues.
I myself use Castrol Edge (in 0W20) for my GJ. But I add a bottle of Lubro Moly MoS2, for that added molybdenum (mimics OEM moly infused Mazda 0W20).
Been running Euro blend Castrol a few years and happy with it. Engine is getting close to 200k, modified, driven aggressively. I'm sticking with works for me.
been using Castrol edge 5w-30 for the past 5 years My WRX engine still feels responsive but i know 5-40w is good overhead for high temps
But the Castrol Syn was good too.
I personally used to run mobil 1 0w-40. as you said its super thin and seemed to just barely get the job done. Recently switched to castrol SLX 5w-30 and I am decently pleased with the first two changes.
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