I have a 1996 Grand Prix I purchased with a bad head gasket-- had a bunch of coolant in oil, coolant burping from overflow tank, overheating issues. Was probably abused something hard, previous owner had the cooling fans jerry-rigged to run 100% of the time, so was likely overheated a bunch. I tossed the heads and put re-manufactured heads from Rockauto on there, replaced head gasket and every other gasket I came across. Engine runs fine afterwards but at the time of this sample I was very concerned it might still be getting coolant in the oil-- oil appeared to be getting brown very quickly and I was seeing a lot of what appeared to be steam under the oil cap. Could detect combustion gas / exhaust smell in coolant overflow. I've since driven it another 500 miles or so since this sample and haven't lost a drop of coolant, so my fears of the new head gasket not taking have mostly subsided. I suspect the "steam" I'm seeing under the oil cap is normal oil mist and/or possibly excessive blow-by. The coolant still smells a bit "off," but I think it just needs another flush or two, perhaps due to how long the engine operated with the bad head gasket. I should note that prior to this sample I changed the oil twice-- new oil immediately after the repair, then again after 5-10 miles with this fill in an attempt to flush all the residual coolant out. So I consider this UOA to be a baseline-- I'll have another UOA performed after about 2k and if there's no coolant contamination in that sample (or numbers are still declining) then I should be able to put the head gasket issue to bed. Presently the engine runs just fine, no overheating and has been returning 26-27 mpg mostly highway miles. I was probably just being paranoid, but if nothing else you can treat yourself to a near virgin analysis (VOA) of Rural King's Harvest King All-Fleet (CK-4 rated) 10w-30 oil. I like what I see in the oil, lots of phos & zinc, always thought that CK-4 oils were neutered in that regard, but I guess not.