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Message: <blockquote data-quote="moots" data-source="post: 511767" data-attributes="member: 219">bro 525i.......super!well i had the e34 for 10 years and i didn't have to go thru the many number of components that you went thru.there definitely is something still not perfect in yr cooling system but hey.....the car's approx 20 years old by now and the imperfections can be complemented by this 'magic' coolant:top: . on the m20 block there is a coolant drain plug located at the lowest part but on the m50 i am not sure.perhaps you cud ask yr mech.i wud use this coolant in a jiff but the price is just too expensive to justify the effectiveness.and also i currently don't have issues with my cooling system.....yet.....he he ....hope this will last forever....like the so called  "lifetime fluid" of the slushbox .......:stupid:</blockquote>