On Wed, 24 Aug 2011 22:02:32 -0400, Metspitzer wrote:

All the oil change places still put 3000 in the window sticker.

I use Pennzoil 5w30 in a Trailblazer with 90k on it. Every 3k miles since
the breakin oil was removed.

Recently had the plugs changed, first time since new. Compression test
each cyl. All 6 (4.2L inline 6 Vortec 275 HP 10:1 compression ratio)
were within factory specs. Also use a Fram high density filter.
Oil pressure is 41 PSI at hot idle, 70 PSI at 2k rpm. The motor is so
quiet it's hard to tell if it's running. The factory 'change engine oil'
light comes on each 5k miles after reset. As far as I'm concerned that 3k
oil change rule is worth following.