My 94 just had a very strange noise and oil leak. One fairly cold morning (in the 30's) I started the car and it started making a slapping noise (like piston slap maybe, but no pistons so...). It did this for a short while (about a minute or so), then stopped for a short while (15-30 seconds), then started slapping again. I shut it down. I tried again later and got the same behavior. I decided to wait until late afternoon to try again. I fired it up and there was no slapping noise. I decided to not drive it. The next morning, I noticed there was oil under the car - a strip about 10-12 inches long and about an inch wide located near the passenger front tire about 12 inches in from the tire. I have checked several times every day since this happened and there is not a drop of oil under the car. Does anyone have any idea what the problem might be? Thanks.