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2006 5.3L Silverado truck has been running with out a hitch until now @ 140k miles, I first noticed that the oil level would fluctuate +/- half a bar (on the gauge). When its cold or idling at its low point, once the engine reaches optimum temperature + at 1800rpm its back to normal. Before the oil pressure would always be stuck right smack in the middle.
Then suddenly, i started to hear lifter noise, not the usual multiple lifter noise when you start the engine in the morning, however