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In Reply to: Engine treatment: What's the conclusion? posted by Phong T Nguyen on October 22, 2000 at 13:21:02:
Now, I've used regular 10W-30 and Mobil 1 10W-30.
The Mobil One Synthetic is noticeably cleaner and clearer after 500 miles than the standard oil which usually comes out of the sump as a black ooze. The engine also sounds smoother and quieter when running with the synthetic
To me this is evidence that the synthetic holds up much better and therefore probably offers better engine protection than the standard oil.
As for Slick 50, etc, ...OK I didn't really answer your question, but this is still on the general topic of lubrication and I thought you'd like to know.