i have 222,000 miles on my cummins and it is using 3 qts of oil between oil changes im using mobile 1 synthetic and when it idles it sounds like it has a mild cam, its stock. im thinking the valve seats are shot or the valve guides are done. what do you think?!

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also is there any difference in the blocks between 03 to 07?

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i am begining to think it may be my turbo, i have to check it tonight.