Here's a picture of my 1999 Buick LeSabre's 3800 Series II V6's lifter valley when the lower intake manifold came off to replace the lower intake manifold gaskets (with GM aluminum gaskets) and upper intake manifold this past weekend at ~67,500 miles. The car first saw Auto-RX at ~35k miles 2 years ago, and was on a maintenance dose until about 10k miles ago.
We caught the gaskets in time too.
We caught the gaskets in time too.