Mr. Walker, sorry to bother you, but I think as you recommend, my oil consumption is going pretty bad, also enigine overheating worries me, so I think is time to do a valve grind, I do not have oil leaking on the ground, I think I will try to fix the engine left bank 3 cylinders valves, where the problem is. As you can see, I live in Cuernavaca Morelos Mexico, and here there are not Porsche workshops, so I'd like you to please, tell me what parts I'm going to need to perform the job, technical assistance, or any suggestion from an expert from you, will be appreciated, Thank you very much for your advise and comments, Cesar.