I change my oil yearly which usually is about 5000kilometers and it still looks clean. I have a fast intentions 34 row oil cooler on mine and for the last 4 years I've never drained it when I change the oil. Until my last oil change I'd used Castrol full synthetic 5w 30 but now I'm using Penrite 10 tenths 10w40 Esther based oil. My car never uses a drop of oil so it's always on full when I check the dipstick.
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