Thanks for the help guys but thank goodness my car head gasket was not blown the computer went out and it caused the engine to misfire I had the computer changed with a rebuilt one and the car is working fine. The trouble was a fuel injector was dumping fuel into a cylinder which was not able to burn all the fuel off thus causing the smoke that was billowing from the tail pipe. the new computer is throwing code 55 and 14, code 55 is the knocksenor on the right side and the code 14 is a ignition malfunction how much will this cost to fix? Can anyone give me some advice on this? Anyway the Tech who fixed everything said that he had to change my oil weight or something; would it be prudent for me to rebulid my engine or should I just play with my oil weight to keep it from burning off?( by rebuliding I mean redoing the o rings on the pistons and machining my head and the engine block etc; I know it will cost me a pretty penny to do, but ,hey, I am planning on keep the car for another three or four years) The car is a 93 es300 and like I said everything works on this car. 4000.00 for the car and 1800.00 for repairs not bad considering its a :P Lexus plus the fact that I hate car payments I think I am still in pretty good shape. Anyways is there any other thing I should do other than regular mtnce which can prolong the life of my engine and tranny .