Read this thread on BITOG. 2 years on conventional -- pics - Bob Is The Oil Guy This fellow used conventional for 2 years with no problems and even had an analysis which looks good other then a little extra copper.I know that synthetics were developed to increase longevity and are less prone to breaking down. I know that oil can't break down with-out mechanical or chemical interaction. So were would that leave the show car guys if they want to help conserve by getting the most usefulness out of the synthetic oil? When does time take precedence over mileage? Just how far can i trust synthetic oil?
I've done 1-2 years on conventional myself in my rarely driven VW bug with no issues. I don't have a problem with a year or more in an engine in good condition. But I believe the one paying the bills makes all the decissions so they should do what makes them happy.