Hi guys, I purchased a new SIDI SV6 MY10 commodore series I from a Holden dealership at the end of last year. I decided to change the engine oil at around 8000kms(before the recommended 15,000kms), when I took it to my mechanic he couldn't get a reading as the Dip-stick indicated NO oil. After releasing the engine oil, there was only around 4.7L which should be 6.5L when full (max capacity). After replenishing the engine oil(Recommended oil viscosity) back to 6.5L and less than 5000kms later, the dipstick showed engine oil levels less than half-way. between "ADD-AREA" and "UPPER-AREA" The car has always been carefully driven, never thrashed and had 98 RON fuel ever since its first refill. Any advice or help would be greatly appreciated.