why an engine oil mix up with a gas ?

1987 TOYOTA VAN
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GEBEX
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my engine has been overhauled and right after some weeks of service the quantity of oil found to be high during morning check.mechanics were giving me several reasons and i replaced valve seals, gaskets,fuel pump,new carbureator,piston rings,plain bearings of cam and crank shafts but it is still going on mixing up.
Apr 20, 2012 at 6:47 PM
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HMAC300
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could be an intake leak, short trips under a couple miles when cold etc.
Apr 20, 2012 at 7:57 PM
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