BB> I have been using full synethetic oil for over 30 years and have used   
   BB> the above proceedure with no adverse effects. I tested a couple   
   BB> engines using 30,000 mile changes with no problems. Aircraft jets and   
   BB> turboprops have been using synthetic oils since the late 1950's and   
   BB> never change the oil only the filter and keep it topped off.   
      
   RW>                R\%/itt   
      
      
   I know you ddi not post the above but I mised it the first tiem around   
   and MUST comment.   
   THAT is NO endorsement that can apply to Automobile Engine oil changes.   
   The operating conditions are Totally different.   
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