Finally got around to doing a compression test. Needless to say I am not crazy with the results. Here they are: 1-140, 3-120, 5-140, 7-145 - 2-145, 4-150, 6-145, 8-145. #3 concerns me. I put a little oil in #3 and got a 130 reading. #4 was a little high. Is there any idea what my...