My shop has a B18C1 longblock for sale for $800. It has 70k on it, and is all stock. I had him do a leak down test, and 3 of the cylinders wer 1-2%. One cylinder was 12%. Im worried about this. He said it could be because it has been sitting for 2 months and the oil has drained into the pan, and it could need a valve adjustment. What do you guys think?