From: kludge@panix.com   
      
   AK   wrote:   
   >I use full synthetic oil (non-name brand) and a Fram filter for synthetic oil.   
   >   
   >My car has 109K miles.   
   >   
   >At 7K miles, the oil looked pretty dirty, so I had it changed.   
   >   
   >How long can I expect that oil to last?   
      
   That depends on what causes it to fail.  Synthetic oils don't break down   
   anywhere near as easily as conventional oils.  Modern viscosity improvers   
   don't break down as easily either.   
      
   But detergents aren't much better than they used to be, and the ability of   
   oil to carry debris and blow-by is no better than it ever was.   
      
   >They claim 10K miles.   
      
   If your engine is new and clean and the oil is failing only due to breakdown,   
   that's likely true.  If your engine is dirty and a lot of combustion   
   byproducts are getting into the oil, it probably isn't.   
      
   >One person said he changes the filter midway.   
      
   Has he taken the filter apart and looked inside?   
   --scott   
   --   
   "C'est un Nagra. C'est suisse, et tres, tres precis."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)