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I think they are quite easy to change, if you unscrew the oil filter, the cooler is the bit it screws on to. You can test it by disconnecting the two water pipes and linking them together. It will take a while for the oil to disperse.
When I have had this problem I fill the header tank to the top and let it slowly overflow, as the oil floats to the top, with perseverance you can get it all out but there will be quite a lot sticking to the inside of the engine so you will have to do it a number of times.
If its not to bad and is running OK otherwise, you can just de oil it every now and again, it won't do a lot of harm, I ran an XM for thousands of miles like that.
Peter
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