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Oil in coolant tank

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Old Apr 15th, 2018, 17:58   #11
S60D5185
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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 didnít 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 Iíve driven about 6 miles and the coolant tank is looking pretty black again !
Could it be residue from the previous failed oil cooler thatís circulating due to getting hotter etc from a longer run, or it that just wishful thinking ?

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Old Apr 16th, 2018, 09:39   #12
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Is it safe to drive a short distance with oil cooler water pipes joined (to bypass the cooler), need to find were the oil is coming from ? Not sure if itís the cooler, someone mentioned the gearbox cooler in the radiator and someone else mentioned the turbo ?
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Old Apr 19th, 2018, 19:28   #13
SwissXC90
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Quote:
Originally Posted by S60D5185 View Post
Could it be residue from the previous failed oil cooler thatís circulating due to getting hotter etc from a longer run, or it that just wishful thinking ?
It can well be.

I've heard garages say to drive a few hundred kilometers, then flush the coolant.
Then drive another few hundred kms, and flush again.
And then again.

It takes a while to get all the oil out of the coolant channels and hoses and pipes.
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Old Apr 20th, 2018, 15:01   #14
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Thanks I will start running, monitoring and flushing!
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