Phew! I just turned over 6,000 miles since my last oil change with Havoline 5W30 and a 3 oz. maintenance dose of Auto-RX. I'm all nerves, you see - this is the first time I have ever taken an OCI out this long, as I was a habitual 3K miles oil change interval fanatic like many others around here. But I'm going to give the GM OLM a shot, and this is why I am doing this. The oil looks good - a little dirty, but still a deep golden color and no oil lost since the initial fill. I'll be sure and get a UOA when the OLM does go off, but given my proclivity for highway driving, the last time it went off was for 18K miles!! YIKES!!