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does anyone even have any evidence that changing the oil at 5k intervals is beneficial? Ive read the LN engineering articles and there is little proof.
Every oil analysis Ive ever seen (mainly in BMW forums) shows, the synthetics (generally Mobil 1) look as good at 10k as they do at 5k.
To me, the oil is not a culprit in these things going bust.
as an edit, my MY99 was totaled last Friday. Car pulled out right in front of me. Had it not been for the incredible build quality of the Boxster, I'd be toast
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