Stepbrother has a 2000 Bonneville, 90k miles and pretty much perfect, extremely well kept. Took it in to get an oil change about a week and a half ago, and he goes to pick up our brothers from school this morning. The oil pressure light comes on, so he comes and gets me. The oil didn't even show on the dipstick when we checked it. I jack it up and look for a leak, and behold - it's dripping from the filter. I tightened it up, got almost a full turn out of it. We took it back to the oil change place to see what the deal was, and we ended up with 2 free oil changes, and it turns out the guy has done it multiple times to other cars!