I have ordered a bottle of Steel Seal. an Alaska Airlines mechanic has used this on tow cars that he bought with blown gaskets for cheap and now they have been running like new for over 2 years. He swears by it but only if you have a lot of consistent smoke. I ordered some but thought i would use the cheaper stuff first from BARs. It's non aluma seal type but uses a special liquid of course. I had to add to the coolant and idle with heater om for 20 minutes. Let it cool down for three hours and then go drive it. Voila, no more smoke, no coolant burn smell or oil smell. Compression is much better. I'll leave it there for a couple weeks then flush it out and fill will good coolant and the Steel Seal to maintain it. Heard it works well on W124s.