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Your pinging may just be deposits from a load of bad gas. Try using Techron - it was originally developed by Standard Oil of California and BMW back in the 80's to clean valves and injectors because the gas we used then tended to form deposits.

A bottle every 2k or so should suffice. And get the full-strength stuff, not the blended 'do everything' stuff which is labelled "contains Techron".

One note - don't use it more than twice between oil changes. SOCAL (Chevron) used to have a warning about that - it seems the solvent can free deposits, some of which end up in the oil, and they were afraid that too much crap in the oil would deteriorate it.
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