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Oil in coolant tank

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Old Apr 15th, 2018, 18:58   #11
S60D5185
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Last Online: Nov 20th, 2018 18:24
Join Date: Apr 2013
Location: Barnsley
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Hi
Since my last post I have flushed the cooling system with 100+ litres of water until it was visibly clear, changed the thermostat as it didn’t previously get to temperature, replaced the oil cooler with one from a XC breaker, fitted new expansion tank refilled and and done 1-2 miles with still some grey water which I have flushed out again. Yesterday I let it tick over to until the the temp needle was in the middle, when I switched off there were some deposits the grey coolant in the tank but not much, again I emptied the expansion tank and refilled. Today I’ve driven about 6 miles and the coolant tank is looking pretty black again !
Could it be residue from the previous failed oil cooler that’s circulating due to getting hotter etc from a longer run, or it that just wishful thinking ?

Last edited by S60D5185; Apr 15th, 2018 at 19:19.
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