5.3 lifter ticking

[ybnaford]

I currently have an 04 silverado with the 5.3. I switched to synthetic at 15,000 which was Mobil one with the Mobil one filter. At 78,000 I recently changed to Royal Purple with the associated Royal Purple Filter. I Have not noticed any lifter tap at crank up. I also, between oil changes, use the Zmax mircro lub which past use has done well. My previous truck was an 01 Silverado 2wd with the 5.3. Had it 4 years and when I sold it, it had 365,000 miles on it. That particular truck always seemed to have a lifter tap at crankup on cold mornings no matter what oil. But it never missed a beat when I jumped in to get down the road. I spoke with some GM engineers some years ago in WV doing a road test with new GM suvs. I mentioned to him about the mileage I had gotten with the truck and he told me they had received some engines in the previous week that were 5.3's that had over 500,000 miles on them. When they tore them down he said most everything was still within tolerance. He said with the routine maintenance they keep running. With the mileage I got out of the 01' I said that I was truely impressed. The only thing replaced on the motor was the altenator at 265,000.