dansk

My '09 5.3 iron block engine was just completely disassembled by the dealer due to a rod knock. Turns out my crankshaft had a flaw in machining. It had not been using oil, at least not enough to add between changes. The mechanic did ask about oil usage though as 2 pistons had their oil rings stuck by carbon and there was carbon buildup on all 8 at 48,000 miles. I've used Castrol since day one and change at about 15-20% oil life. They suggest I change to a synthetic blend for the future. Maybe stuck oil rings are some of the problems seen by others.