recently changed the oil on my QC and send a sample off for analysis to give me a baseline from my change @ 15,000 miles. Well at 20,000 miles my lead reading went from 16 to 41 with 29 as the unit avg and 15 as the universal avg. The copper and lead readings are also about 3 times the universal avg of 2. AmI looking at problems down the road? there was 4200 miles on the motor between oil changes. [>:]