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Of course it's fast
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Oil isn't made to burn like gasoline does. If there is enough oil in the cylinder when you start it up there is a chance the oil won't all come out immediately, leaving hot oil residue in the cylinder and can cause preignition. You'll also get a nice layer of gunk around your exhaust valves over time. There's a reason they don't build cars with leaky valve seals. Your cat(s) if still there, will get clogged up too.
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About the seafoam, it's probably not a good idea to use it in the oil of a higher mileage engine since it can cause gaskets to start leaking.
 
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