Holden Commodore: Engine pinging

We contacted Holden about your concerns and received the following response from its spokesman John Taylor. John told us that there was no direct relationship between oil consumption and engine pinging. He went on to say that if there is a pinging condition affecting your car then the Holden dealer could address it and they would be happy to put you in touch with one of the company's Customer Assistance Service representatives to do that. Should you want this to happen get back to us and we will advise Holden to set that process in motion. As to your assertion that "Holden has relaxed the tolerances on the pistons in the late model Commodores (SIDI engines), allowing oil to get past and gum up the motor with carbon", John denied that was the case, saying that Holden has not 'relaxed' any tolerances of pistons/rings that could then cause the engine to 'gum up'. Again he made the offer of putting you in touch with CAS to discuss your concerns.