Slight problem during oil change, what to do next?

[Mauiguy]

Hi,
I am changing my oil on my 99 Boxster (Standard, not an S). I've always changed my own oil but this is my first time on the Boxtster. I used a ramp on the rear driver-side wheel and rolled up that so I can get my drain tub under there. I let it drain for an hour at least and going back to it there's still a slow but constant drip coming out. No problem- without turning the enging on I rolled it down the ramp and got a smaller container under there. Sure enough, a faster drip ensued so I thought ok good, let it drain some more. Waited a while, went back to it, it's time to get the drain plug back on. I couldn't reach so I had to start the engine and I ran it for the 5 seconds it took to back up the ramp. However, in that short time it definitely made a loud grinding noise. In my other cars I would occasionaly have to run the engine just long enough to reposition the car but never heard a grind. I haven't even added the new oil back in yet, figured I'd check with you all and see if there's anything special I need to do here. Do I just add the new oil and hope for the best?