Quoted:
Now I just use synthetic,Mobil 1 to be exact.I just got my oil anylyzed at 4k on my truck they said it had penty of life left in it and it was still very clean ( I use K&N AirFilter to).
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I use Mobil 1 in my Neon. The longest run I've had with a subsequent analysis was 8000 miles. It was hardly even broken in yet...I could've poured it back in. This summer, I'll test at 10000 miles.
People I know who I trust to be fairly technically knowledgable and not prone to pulling things from dark and smelly crevases assure me that unless there is something wrong with my engine I won't see my Mobil 1 go out of spec until at least 12000-15000 miles.
As for the Slick 50...tried it years ago, ditched it, and ran Engine Restorer additive in my 'Cuda. It actually did do /something/, since the oil consumption would drop significantly with the Engine Restorer versus the same oil without the additive. The seat-of-pants dyno said the car ran better, too.
Jim