Thought I'd share these pics. Brief summary: At about 129,000 miles I added water methanol injection to my truck. The claimed benefits were increased power, mpgs, and cleaner engine. I saw the power and mpgs for sure. But now, after spraying for about 250,000 miles I got a little peak inside the engine. Here is the pic from 2008 when the truck had about 129,000 miles and I installed the water/meth: Not too bad just a little crud. Here are this weeks pics when I pulled the intake off: (the wet on the outside is the lube I sprayed for a couple days fearing stuck bolts) Side note: I've seen pics of stock trucks with under 100 k and the intake 40%+ clogged with soot. I played with different percentages of meth, but for the most part I sprayed straight water and only added methanol in freezing temps.