I know the synthetic oil technology has probably advanced to allow extended life but I can't shake my old school mentality that oil is relatively cheap compared to my 30k GTO. I also get concerned about combustion biproducts that end up in the oil, acids etc. and like to keep fresh oil in the engine. I prefer to change mine every 2000-2500mi. w/ filter whether it needs it or not. Plus it keeps me out in the garage more, away from the teenage daughter and wife debates or vacuum cleaner sound! I would rather rotate the spark plugs in my '94 Z28 with the SLP headers in the way than be the referee for those two!
The garage is my friend..
2005 GTO, M6, Quicksilver / Black
2003 GTP, Silver / Black, 3.4" Pulley
1994 Z-28, Red, M6, Hotcam, SLPs, Tune
1994 Z-28, Red, M6, stock
1994 Cadillac STS
Last edited by cat1055man; 12-23-2005 at 07:25 AM.