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Message: <blockquote data-quote="AuroraGirl" data-source="post: 23449" data-attributes="member: 9417">GM did a lot of inhouse engineering at GM powertrain, but they were manufacturing the parts with poor QC and the amount of TSBs that pop up for improper assembly or machining for batches spanning MONTHS or YEARS on existing engine families that did not have this issue before is very tellingthe 2003-2009 3800 is a great exampleThey didnt have so many leaky oil seals on the block or heads (valve stems and rear main) in 1995 when the 3800 series 2 came out but suddenly EVERY gm engine in the 2000s had a TSB addressing valve stem seal leaks starting around 2003 or so (engines at least made by gm, stuff like the vibe/vue have a toyota engine) which is pretty tellingThe 2006-2007 3800 is a gamble to put it lightly , either the engiens are great or they have chocolate milk and accelerated wear if they still run, my 2006 la crosse got killed by thattook them 11 years (11!) to fix the NorthstarThey did a 1999 running change to improve the head bolt situation which didnt do much and then the compression bumped down in 2000 But 2004 , they fixed it.Enough time to spoil a complex and great concept for everyone They had a lot of strange choices in the 90s for engines too , stamped pans were a great example.... 2 layers of steel with composite center.   none were flat and true and leaked a lot it seems</blockquote>