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Message: <blockquote data-quote="pussy" data-source="post: 219224" data-attributes="member: 60">dun need to worry who's right or wrong here.. there's two school of taught here.. the old school is those days the cars run hot with out ac, the parts used in the engine bays were old technology hence every day when my dad comes home, he pops open the bonnet to cool down the engine bay.. did help alot there on the longevity of the engine and most important the hoses and wires.. new school, all the parts can with stand the heat of global warming hence the parts are new tech even so, we do cool down the engine after high run.. i have never open my bonnet on the e30 since two years of M50 engine installed, only when i want to do something to the engine, mostly after a long run i wait for the fan to cut off, then switch off the engine, this is to maintain the engine oil tempreture be at it's optimum before i shut down. the other teory is the hot to cool off period is to maintain the different tempreture levels of the compotents of the hoses and other parts..too cold(like wash engine) will shorten engine life. as for e28, yes, it is vital to cool down this way, cos the engine is old, with the brittle sockets and wires.. but i can due to the car is parked outside.. so there..</blockquote>