I too am having oil consumption problems, that I have noted in other posts here. I have just rolled 30000 miles. New til 6000 miles this thing you absolutely no oil between changes, from 6000 miles on its using a quart every 800 to 11 miles. The bolts you are referring to is the INTAKE bolts, not the exhaust, big difference. This change made absolutely no different on oil consumption on my 2500. I am in process of going to the dealer every other friday after work for them to check oil level, they call it a "consumption test". I am hoping for one of two things to happen, one they find out what is going on with this things, or two, it finally gets broke in and is only 1 quart low at 3000 miles instead of 3 quarts. The dealer has other 8.1's doing the oil consumption test, and said one farmer was using more than I, until the truck turned 60000 miles, then poof the truck used no oil between changes. I plan on posting any info I get on the subject, as I hope every else with the problem does also. Suggestion keep every receipt/ service order and make sure it has the words "low oil level" or "excessive oil consumption" on it, worse case it things come to a head with GM, you'll need all the documentation you can get.