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There are benefits to synthetics in certain applications. I have never used in race motors except to test. I use where manufacturer recommends. My Altima only use syn, the Suburban uses conventional because it uses synthetic fast, less than 1/2 miles to lose a quart. The RV use syn blend.
Change intervals are between time and use. May be a waste of money sometimes but also go off what oil looks like. When brought RV home, had 1900 miles. Changed oil immediately and every 4500 mile/ annual change the oil looked clearer (not scientific) and same every change. Air cooled generators hard on oil. Most get oil pretty thick and sludgey after too many hours. Racecar change interval depends how many runs and how many issues. Loose piston wall clearances cause lots of blowby fouling the oil.
Everybody has different angle so do what you feel comfortable with. Since I really do not have any oil issues, will continue doing same.
Cost between conv and syn is negligible these days compared to start. Also the actual synthetic designation has changed with time.
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