was drivin through lampeter and was doin a weird popin sound like it was missing or summin, and just felt guttless, gt into co-op carpark and there was smoke pouring out of the exhaust !! took the spark plugs out nd the "tunnels" like the thread bit (duno what theyre called, where the plugs screw in2) were full of oil!! oil was clean, no mustard colour and the water is fine to so thought it probably wasnt head gasget . so cleaned em up put em back in and no change! engine shakes like mad when reved, and so much smoke!! the mechanic i use said that the piston rings have probably gone in 1 or 2 of the cylinders, just wondering if any1 else has experienced this or has an idea what could be wrong?