Update:

I had the rad replaced as there was adefinate blockage, all the coolant drained and a new cap and expansion tank (old one had some fractures) Oh, and new hoses too.

Theres no more oil getting into the coolant anymore. I assume it must have been ATF or engine oil getting in thru the rad. Very odd, but now its fixed.

Thanks for all your help !

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Brian Drought
1991 300CE
http://www.users.globalnet.co.uk/~drought/
ICQ: 2180069