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This Atlas LL8 inline 6 is notorious for noise when started cold in the older versions. Some help is achieved by using Mobil 1 5W-30 Synthetic oil. Do not use a heavier weight oil as that will compound the problem and may lead to early engine failure. There are many of these engines with over 200,000 km still running fine at this point in time. is a forum dedicated to these types of vehicles. You can get realtime answers by the other owners on line.

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2007-04-11 14:23:43
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Q: Trailblazer has a terrible valve noise in starting and it disappear when engine is hot although oil is new and changed by GM Italy?
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