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Depends upon how it is being used.

For turbocharged auto engines, one should use Synthetic oil

Regular grade oil can be used in all other applications.

Oil analysis tells the true answer here. Given the same engine in good working order and doing an analysis of each the synthetic oil will have a much better analysis and show less deterioration than the equivalant petroleum based oil. Synthetic oil can be left in for longer change intervals than petroleum based oils because they handle high temps of todays engines far better. I agree with the above and would use nothing but full synthetic in a turbo charged engine. The turbo fan spins upwards of 20,000 RPM, gets extremely hot and will break down petroleum oil quick.

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16y ago

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