One guy on a forum said his engine turned grey with the LA stuff overnight. I would not soak it too long. Rinse it and spray WD 40 or whatever, so it does not go chalky. I had that. I soaked my carbs for 10 minutes or so. As soon as it moves, things get better. Getting it to move can be hard. A bit of heat helps, but I have not needed that yet. Looks like bearings too. Too bad, so sad.