Hi again all,

I have done a fairly thorough search, but haven't found a clear answer to this problem. I've seen posts talking about bad injectors and the need to rebuild them, but I don't think this is my problem.

I've had my 300D Turbo for only about 2 months. It had a full tank, to which I added diesel conditioner with cleaner, lubricant, and anti-gelling. I've done a diesel purge with Lubro-Moly and changed both fuel filters.

Last week, I filled her up after a 180-mile trip for the holidays. Now I'm getting a pinging noise when I accelerate, like a gasser would get on low octane gas. The noise is not there at idle or cruise speeds, only acceleration. It's not the normal knocking of a diesel engine. Could I have gotten low-grade diesel? Is cetane boost the fix?

'85 MB 300D Turbo, 254K miles