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My Fiesta only calls for oil changes every 10k miles but I guarantee they need to be changed by 5k or performance will suffer. I have changed my own oil and seeing what my car does and what the oil looks like when I'm 1k over my normal 4K change tells me that unless you're driving very conservatively, 10k oil changes can't be good for your engine longevity. Testing is obviously ideal. But I'm curious how the 2.3L in the focus RS takes 5w50 and this engine takes 0w20? Interesting indeed. I don't doubt longevity of this engine otherwise bmw wouldn't put it in everything but I find it interesting none the less.
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