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<blockquote data-quote="criticalbass" data-source="post: 2099374" data-attributes="member: 711">Blue smoke = oilBlack smoke = too rich a mixtureWhite smoke = condensate in exhaust or anti freeze getting into a cylinderRainbow smoke = really good drugsIf it&#039;s oil, it&#039;ll be blue.&nbsp; If you are not using much, the thing to do is to rule out cheap problems as suggested above, and to drive it and enjoy it.&nbsp; With 175 k of well maintained miles, I suspect you can get another 50 k with not too many problems.&nbsp; Valve seals on GM used to be a big problem.&nbsp; I have replaced a bunch with Ford &quot;umbrella&quot; seals.&nbsp; However, it&#039;s my understanding that they fixed that design problem before your truck was built.You might pull the plugs and see if they all look alike.&nbsp; the problem, if there is one, may be associated with only one cylinder.&nbsp; Could even be an oil control ring sticking a little on start-up.&nbsp; Given regular oil changes, probably not.</blockquote>

[QUOTE="criticalbass, post: 2099374, member: 711"] Blue smoke = oil Black smoke = too rich a mixture White smoke = condensate in exhaust or anti freeze getting into a cylinder Rainbow smoke = really good drugs If it's oil, it'll be blue. If you are not using much, the thing to do is to rule out cheap problems as suggested above, and to drive it and enjoy it. With 175 k of well maintained miles, I suspect you can get another 50 k with not too many problems. Valve seals on GM used to be a big problem. I have replaced a bunch with Ford "umbrella" seals. However, it's my understanding that they fixed that design problem before your truck was built. You might pull the plugs and see if they all look alike. the problem, if there is one, may be associated with only one cylinder. Could even be an oil control ring sticking a little on start-up. Given regular oil changes, probably not. [/QUOTE]

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