hi there my 85 244 turbo intercooler, has a oil leak. it leaks only when driving and not at idle. i think it is leaking at the thermal vacume valve, it has two vacume hoses going into it and it is blue on my car. since i can not actually se it leaking at idle it raises my question=the blue plastic portion can be easily spun around with my hand. this dont seem right but i dont know? my first turbo. the bentleys tells me how to test it to see if its closing like its supposed to but that does not help. thanks.