It seems there are very knowledgeable people here that know about my TV my 5.3 has a light tap when cold I read they tend to have a piston slap that is harmless but I think what I am hearing is a week lifter, because when I change the oil (I only use either Mobile 1 or Lucas 5/30) the tap is gone for the first few days after that when it's cold I hear it for about 10-30 seconds an it's gone. I also read it could be a O ring in the crankshaft mounted oil pump! Do you think this is something I should deal with asap? And were would you start? The O Ring or rip the heads off to replace the lifters? That's the only thing I hate about the engine design that the heads have to come off to service the lifters. Thanks for All the advice so far. :)
