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Well I've just checked the pipe out of the top of the AOS and there's definitely oil residue in the pipes.
As expected, the car smoked for a few seconds as it cleared whatever oil had run into the engine from the last 'episode' last weekend, and now runs clear , and will stay clear now after a few starts until the next time.
The oil is definitely getting up through the AOS somehow, despite the AOS being a new one and the car NOT displaying any of the classic AOS problem symptoms.
I'm going to change the oil again. I put in Mobil 1 0W-40 when i changed it 3 weeks ago, and the oil that drained out the car at the time seemed very free flowing. So I'm going to try something stickier, like 10W-60 and see if that makes any difference.
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