Neither variety of Berryman Chem-Dip (part #0905 or part #0996) is suitable for the application you’re suggesting as they both contain water in one form or another. If the engine runs but has severe sludge, a better bet would an engine flush. We offer Berryman Oil Change Flush (part #1216) designed for that task. Berryman B-12 Fuel Injector Cleaner (part #0116) can actually go into the crankcase, too, at a ratio of 1.5-2 fl oz of product per quart of oil capacity. 0116 is the more aggressive cleaner of the two. Note that if the problem is especially severe, you may need multiple applications.