Hemi Smoking

Don't cringe toooo much, but I had a Land Cruiser (V8) with about 200,000 on it and I started getting piston slap. I put about a quart of Marvels Mystery Oil in it for about 500 miles and it totally went away. The engine had about 250,000 on it when I last drove it and still no piston slap. I always ran a good full synthetic oil in it.