Hello I'm new here and I have a general question.
I have a 1999 G/M LS and it seems that shortly after an oil change
when accelerating on the highway I get a knocking sound. (Sounds like a rocker knock.) If I add another quart of oil the problem goes away for a week or so then creeps back. When I first pointed the sound out to the service person at the dealer he said, " It will make that sound sometimes. Thats the way the engine is." Two other dealers blew me off with that answer. I added a oil additive and the sound went away for three weeks at the last oil change. Is the dealer using the wrong weight of oil? Or too little oil for the engine?
Any help will be helpful.
JohnnyGo