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Mad:
I believe that all synthetics are compatible with pertroleum, so that if you are changing from petro to syn, there is no need to "flush".
However, I have always wondered just exactly what the constituant parts of synthetic motor oil are. Does anyone know exactly what the material is? I have run Mobil-1 now for about 5,000 miles, including track events, and the oil is still "clean and clear". Quite unlike my petroleum-based oils like Kendall GT-1.
What is synthetic made of?.......Andras
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