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Originally Posted by fernando_g
Interesting!
What I don't understand from your graph, is what you mean by "after draining extra quart of oi from engine"
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That data point was measured using the same protocol as the other data points but after having drained an extra quart of oil from the pan. This is consistent with other reports that the optimum oil level in the 1500 CC Prius engine is 3/4 between the marks. BTW, on Wednesday, I confirmed that there is oil in the manifold, which was reported as another side effect of an over filled oil pan.
Bob Wilson