Hi there, oil stop leaks work by swelling the seals, not just the leaky one but all seals in the engine, and with this they can fail after a while as they are soft and can damage easily, not all oil leaks are seals so this will have no affect on non seal leaks, this can cause longer term damage, don't use stop leaks they are not the answer to your problem.
Mark (mhpautos)
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Friday, December 11th, 2009 AT 2:20 PM