Okay, I had the oil changed on Friday, changed the plugs and wires on Saturday. Sunday on my way home from work I noticed a slight squeeking coming from the engine. As I accelerated, it would get faster. Monday morn, squeek still there for about the first 2 miles then it went away. When I changed the plugs I noticed some dirt around the plug holes that I was careful not to get in the block. If I did somehow manage to get some in there, am I screwed? Can I just drain and refill the oil?