Just purchased from a local car dealership. Not worth the money, just not strong enough. It might be good for lubrication, but "dissolves instantly on contact" for oil and everything else that the label says just isn't true. I put the cylinder head on, let it soak for 2 days, I didn't clean the oil off my head, not a bit! However, the Gunk CC3K carb cleaning is amazing and cleaned it like a whistle in less than 24 hours! If you need it to clean the inside of an engine, go ahead, it's uselessβ¦