Great to see someone else at the W on the stick too. Taking a beer break after getting the oil out of the red 5S Fontana car. But to get a rough idea of what is coming out compared to going in, I took a tip from Breaking Bad weighing money and I weighed the oil (9qts in the bottles in a box weighed 20 lb and there was 20 lb that came out into the plastic oil container). So ballpark wise, it seems all the oil is coming out like you said. When filling with oil I recall someone said to just put in 8 at first, then run the car a minute or so and then add the last quart. Could be it was Tonto recommendation, so I always have done that.
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