In my honest opinion, I am not real supportive of additives, but I am in the repair business. Will it work, I don't know. I have never had any experience with anyone who has used it.
I will give you this scenario. Assuming that it has an internal leak, the cause is aluminum thread failure in the head bolt holes. Could be one, two, or several, on one or both banks. A sealant is possibly going to help the current leak, but will not restore the retention(clamping) of the stripped hole. What is likely to happen, is holes around the stripped one are going to fail, as they are more relied upon to sustain the load. This comes from heating and cooling, expansion and contraction.
A lot of the reason I don't support additives, especially in the cooling system, is this. You add it to a tank, with not alot of turbulent water flow. The heavier portion of the substance is likely to settle to the bottom. If in fact it does make it main stream, is the leak bad enough that it is going to seek and plug it? I have seen more of the sealants trapped in the bottom of radiator tanks, and blocks. It could lead to increased cooling system temperatures, and a higher potential for overheat.
The assumption that you have an internal leak is just that at this point. You would need to have it tested to confirm. A block test is best done with a gas analyzer, like the one used for emissions testing. Roadtest the vehicle until warm, have the gas analyzer at the filler when the cap is removed. Any reading over 100 PPM hydrocarbons indicates a cause for concern. As far as Steel Seal, on a consumer basis you could give it a try. If money, or repair costs exceeding the value of the vehicle are a concern, it is your best option.
Wednesday, July 28th, 2010 AT 11:26 PM