From what I found now, cheap mineral oils like Magnatec and even FEO last about 7000km with sedate city driving. After around 7000km my engine goes very rough. I have tried it twice and it always happens around 7000km. The midrange oils on the other hand like Edge 0w-40 and Motul 8100 don't go rough. But I do notice a loss of torque at high rpm, as if the oil was too thick, after going for a trackday and then another 3000km of street driving. So for me, the mid range oils are sufficient, eventhough I track my car. But, if your car budget allowed the use of high end oil, go for it by all means. I just get ticked off when ppl say to get 300V because the engine will feel more powerful. LOL. Thankfully, that hasn't happened in this thread yet.




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