i put a can of engine restore in today and so far the knock has stopped. i will know for sure first thing in the morning if it has helped because thats when it was the noisest. this truck has 70k miles and would you be afraid to keep it?

 

this morning temp was in the 30s and on a cold start up my h2 did not make the noise i had been hearing! now do i keep adding this to the truck everytime i hear this noise or do i trade it off?