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If you mean engine oil then this is because the crank mechanism in the engine need to be lubricated for efficient firing of the piston in the cylinder, there by increasing the speed of the truck and also durability of the engine. == correct answer== if engine is blowing oil,but still running fine, you more than likely have bad valve stem seals this allows oil to run down valves into combustion chamber fix it before you burn out ya valves

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โˆ™ 2007-03-04 14:47:33
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Q: Why would a truck blow oil but run great at high speeds?
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