for HLS nad all in the dexcool debate....

i REALLY appreciated and enjoyed the educated input from HLS and the websites offered concerning Stant caps...and i am running into what i consider a contamination prob in a 3.1 99 lumina (bought for son)...ive flushed and refilled with new coolant until im blue! still after bout a week there is the scum back at the filler neck....unrelated = repaced intake gasks. 'bout new years (112k miles, normal for design)...scum line before, scum line after.....ive been working on thousands of these engines (2.8 to 3.4 / mid 80s to today) but we sell at 40kmiles so i dont get to see most of the higher mile probs........i dont know that i will ever get this cooling system to what i consider normal but i still appreciate the overview by the folks here that have been experienced in the upper miles of dex-cool................kjun