Start the changes at low intervals. The delvac 1 will cleanb quite a bit of sludge. Id say 3000, 3000, 5000, then the interval that the oil analysis then tells you.

Do the analysis when the oil is hot and just driven (thats the way you ought to change oul anyway). DOnt worry, you wont melt anything or burn yourself. Let a bit of oil flow out before sticking the sampling jug in there.

Take the first few analyses with a grin of salt. Sludge will have quite a bit of wear metals, etc.

JMH

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