Any engine will turn a bit slower when its cold, think of the oil sitting in the bottom, as its colder it becomes thicker hence stiffens the engine, its like you trying to run through syrup compared to water, it will slow you down, plus the fuel will ignite better at a higher temp HTH
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SAAB 9-5 HOT Aero Audi A4 1997 TDi Avant (old smoker!) Iveco Turbo Daily Recovery Lorry
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