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Yeah, cold start is for the cats but the manual says to drive moderately right after starting so I don't get why we need it. It only lasts 30 seconds along with the loud secondary air pump blowing air through exhaust to move (atomize) rich fuel out through the cats. Cats don't like unburnt fuel in them as it prematurely wears them out.
That's why it's best to drive off immediately in a light manner, just baby the car until oil is at operating temperature then go crazy. All this cold start and SAP are really for the people who drive their car two blocks and turn it off.
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--Trevor--
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