Hi guys, My first post. I wish I knew about this site in '94 when I bought my Suburban new. I love it, but with 225K+ miles she's getting a little long in the tooth. This car has always used more oil than I'd like ( about 1 qt per 1500 miles). GM says this is normal. In the last 20,000 miles or so I'm seeing Blue smoke in the exhaust. It's always worse if I'm idling, although it's intermittant and seems to go away as I'm driving(no blue cloud trailing). There's also some white vapor mixed in, especially when it's cold out. OK, so I'm thinking the head gasket has finally given up the ghost. I checked compression and all cylinders are 130-145. The plugs for 2, 6 and 8 have a HEAVY, chunky, crusty tan deposit. OK, so I'm thinking that excess oil is burning in those cylinders. Is there an easy way to check if the oil source is valve seals vs. head gasket vs. worn rings. (Obviously, I'm hoping one of you guys will tell me the rings are probably OK based on the compression Numbers). The motor runs great with no trouble codes, although power is down a bit in the midrange. Any help would be appreciated. I'd like to do the work myself.