I've had my truck exactly 5,000 miles as of today and according to the sticker on the windshield it was due for an oil change, so I went in and had it done. But while I was sitting on the rack I read the owners manual and apparently the truck will tell me when it needs an oil change based on oil quality. Is this a reliable source? Does anyone trust this? Or should I just stick with the standard 5,000 mile interval?