Quote:
Originally Posted by 97 SL320
Sodium Silicate sealers will actually seal / dramatically slow down a combustion to coolant leak. Hot gasses fuse the fibers locking them together.
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I used Blue Devil on an OM603 and it bought me 12 months and about 15k miles. The crack was so bad that it hydro locked the engine but Blue Devil fixed it. I eventually replaced the head. It may be caused by further cracks and not the Blue Devil itself but one would never know. It will buy you time to sell it. If you intend to keep the car then a new head or gasket is in order.
If you use it, follow the instructions to the letter and REMOVE the thermostat first. Good luck.