Have had the 15,000 km service this morning, capped price $239. including a free punctured tyre repair which I didn't notice before. The workshop took the wheels off to fix the squealing brake and saw a nail in one of the rear tyres, they repaired it. Apparently Holden has acknowledged the squealing brakes and issued "Insulator-RR Disc Pad" under warranty and the workshop also lubricated Front brake calliper GDE Pin. The result - No more squealing brakes after the service so far, before it squealed when reversing. As to the cold start clattering, they couldn't hear it this morning and said that if it still happens in the coming days, I will need to leave the ute overnight at the workshop. They noticed the Ryco filter I used for the interim 7,500 km oil change, advice me to use OE filter, saying there is a valve in the OE filter to stop the oil drain back into the sump, but I thought the Ryco filter also has it? On the work sheet, it only says that they are using GM Dexos 2 oil, don't know the exact grade. I will see if the cold start clatters persist in the coming days before finding out what grade of oil the workshop uses. Over all, I am quite happy with the 15K service, dropped the ute at 7:30 a.m. and got it back at 11 a.m.