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5w30.
I think DS will beat CS on the smaller courses with digs that I've seen the past couple years in the smaller lots many regions have to use now. I couldn't match my own time in a GS Civic Si with my CS FR-S two seasons ago because the Si could dig out of the 3-4 sub 20mph corners!
On a normal national course, CS should have no trouble gapping DS. Pittsburgh does have strong DS drivers though. The PittRace national events I attended years ago favored the slow dig type course I mentioned above... if that is where events are held?
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