My last Cummins used about a quart of oil every 2000 miles until I towed heavy and had about 10,000 miles on it. After that it didn't use any between 3000 mile oil changes. My '05 came with the oil about 1/4 inch above the full mark on the dipstick. Now, after 1000+ miles, it's still about 1/4 inch above the full mark. It turned black of course but didn't go down any. Has this been the experience of others? I expected to burn a little oil with a new engine.
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