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By virtue of the fact that you use synthetic oils, (ie., Mobil One) the varnish and gasket hardening is virtually eliminated. You might want to see the Mobil One web site: http://www.prod.mobil1.com/index.jsp, for a more technical description.
Redline and Amsoil have similar ratings and websites.
I use Mobil One for a number of reasons: 1.It is widely available 2. The price is cheaper than either Redline or Amsoil 3. Mobil One periodically goes on sale 4. It is recommended 5. I have a history with the product. 6. In the interest of bias disclosure: I also own the stock. I bought the stock actually WAY after using the product for a very long time. So you can see me as a real dummy or a real dummy!
Also remember that this is old and used model pricing has been dropping as the 0% financing has been extended to new years.http://www.vetteweb.com/features/0205vet_prices/index.html
Then for more discussion here is a link to another board with people's inputs on the C4 vs. the C5. http://forums.corvetteforum.com/zerothread?id=413251
good luck in your search, love the C5 here. It helped that the kid got out of college in 4 years.
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