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You guys are nucking futs!! 215,000mi on a 4.3 GM and I never raise the hood between changes!
Bob
Quite surprised you never had the infamous GM intake leak.
I would be checking that oil every three weeks or 1K at-least. Even if you feel no consumption occurs, you should still check it for dilution purposes associated with the intake leak. Some of those leaks gett big & nasty in a hurry. Others don't acquire major leaks.
Keep rolling that dice - or check that oil mark occasionally.