Can anyone point me to a good forum for 5.3L GM V8s? I'm not looking for one that talks mostly about mods and souping them up, but one that discusses issues and maintenance. Thanks in advance! BTW, Love this forum. Lots of good info. I'm running M1 5w30 in my 03 Tahoe with 43000 miles, and Pennzoil Platinum 5w30 in my 04 Suburban with 19,000 miles. Both run Supertech oil filters and my OCIs are determined by the OLM.